No matter how much I smoked, I never had open-eyed visuals. (Only some REALLY REALLY mild closed-eye visuals, like random shapes and weird objects, kind of like when you're in a semi-dreaming state). Also I never heard people/things/whatever talk to me. At most, the voice inside my head (when you're thinking, etc.) sounded a bit more like someone else talking, but nothing serious - I could tell it wasn't anyone else saying anything, just the sativa I had smoked.
But then again, I always knew my limits, I never smoked more than I knew I could handle, and I've been doing this for 2 years so I know my shit. I've had days when I'd smoke 2-3g's of high-quality skunk in 4-5 hours by myself and not feeling tired at all or even that high (huge tolerance). This is the same skunk which totally fucked me up with 0.1g when I first started smoking and put me to sleep after 1-2 hours of a very intense psychedelic experience - music sounded so out-of-this world/my thought processes were so deep I had incredible revelations (that was the beginning of me becoming an atheist to be honest)/ stuff like that
I do have a friend however, who smoked some synthetic cannabinoid with me and 2 others one night, his trip was kind of like yours, actually even more fucked up. Keep on reading if you're interested.
Summer 2010. I was at the beach with 3 other friends (S, V and B). Legal highs were getting more and more popular here in Romania.
We were all relatively new to the drug scene, had smoked before but not very often and not a whole lot, we had a bunch of good trips though and knew what to expect.
On the previous day before this incident, I had smoked some herbal mix containing synthetic cannabinoid (like jwh-018 and the like - don't know what it was called though) with B, and I had quite a bad and intense trip - I ended up laying down on a rock besides B who was actually enjoying this. I seriously thought I was going to die that night because I couldn't feel my tongue, my heart was racing, everything felt so unnatural, my hands lost 40% of tacticle sensation and everything I touched seemed so odd and strange, almost like I wasn't touching anything; I was extremely paranoid thinking I had smoked some poison - the usual stuff.
So on the following night B and V decided to buy some more, but this time he asked the dealer at the headshop to give him the strongest stuff he had. He laughed in an evil way almost like one of those villains in crappy cliche movies and gave us 0.25 of the stuff saying that it is the absolute bomb, the best you could find around there.
So we go to the beach, we roll a joint, and light it up. I only took 3 hits from the joint because I knew I had to take it easy to avoid another bad trip like the one I had the previous night. My other friend S took 3 hits as well, V took around 6 hits and B, who was as inexperienced as all of us and unaware of any dangers, took around 12 solid hits (he smoked most of the joint by himself to be honest).
So we finish it, I can feel a mild high. My friend B looks really really stoned and is laughing at anything we say & stuff, basically just having a good time. After like 5 minutes, me and S were still only barely stoned (almost unnoticeable); V was pretty high and enjoying himself; B stopped talking and his face turned white, he said he wasn't feeling so good.
Me, S and V walk away to a place about 20 metres away where we could sit down without getting sand up our asses, B stayed back and wasn't doing or saying anything, he was just laying down in the sand looking at the sea. We just figured he needed to be left alone, we would have just made him paranoid with our sarcasm and dark humour.
10 minutes passed from smoking the joint and then all of a sudden B gets up and starts walking towards us, very sluggish, like he was piss drunk, walking sideways and all. Then he stopped a short distance from us. Stood still for 10 seconds, and then started to projectile-vomit all over the place - luckily he was on the beach.
We went to buy him some water but ended up buying a coke instead, don't know why. He came to where we were staying, saying that he was feeling incredibly bad and that he had smoked too much and that he just needed to chill out for a bit. We left him alone. The high was almost unnoticeable for me and S and V was giggly and having a great time.
Then B starts to vomit all over the street and everyone passing by was looking at us like a bunch of losers. We took him off the street and back on the beach where he laid down. At this point he wasn't responsive to us (he was in his own little hell hole) and was puking once every 2 minutes. After about 15 minutes he was still trying to puke but had nothing left in his stomach, so he was constantly gagging. He didn't really say much during this whole trip. He ended up puking (or trying to) for a total of 2 agonising hours.
At one point during this whole ordeal, I went to him to ask him if he needed us to call to get him anything, or call the ambulance. He didn't answer my question but started crying and begging us not to leave him there all alone; I comforted him and said we'd never do such a thing.
When he finally came to it, he said that he was almost sure he would die. He said he had very vivid hallucinations of being sorrounded by 30+ people, all looking at him and talking about him, wondering what drugs he took and calling the police. These were probably some passing tourists, but there were never more than 3-4 people next to him at any one point.
I do not know if there was anything else in the herbal mix besides synthetic cannabinoids, probably not since me S and V all smoked and had a relatively normal trip.
B totally recovered the next day, he didn't suffer any mental or physical damage of any sort, so relax, you're fine.
I guess shit happens.
Stay safe, know your limits, know what you're buying.
Your weed wasn't laced.