To answer the original question
Was that a form of cocaine withdrawal or not? Again the answer depends on a few things. 1) how long you have been using 2) how much you normally use 3) the method in which you normally used AND 4) the method you and your friends used that night.
Since you say you and your friends divided an 8 ball, that means you did approximately 1 and 1/4 gram to yourself, maybe a litttle more, maybe a little less. My guess is that it most likely was NOT W/D's. Sounds more like beginners reaction to a bit more coke than you're used to. Granted, I'm only basing this on my own personal experience as well as those numerous experiences told to me by other users.
Are you normally a snorter, but went to smoking or IVing with your friends? I had 7 years on again off again experience with coke. The first few times I snorted and felt practically nothing other than numb sinuses. The next few times I got the short acting high, but I noticed sometimes would make me puke. Than another time 5 years into my using, I did about 3/4 gram to myself in a 24 hour period. After the high, I got some chest pains, and I couldn't stop puking.
I became concerned enough to confide in a Dr. who was a coworker of mine I KNEW was cool. After asking a few questions like "Was that more than you normally take?" to which I said "yes," he said "Well if you want I can call in some compazine for you to manage the vomitting, but please be careful cause I've seen people come in with cardiac arrest." Warning heeded. I was sure to increase dosage only slightly after that and I never had that problem again until the night I spent with Steve.
Make a long story short, Steve an ex bf from when Jesus was a baby, had IVed me with coke on 3 different occasions. Since all the other times I had snorted only, I'm sure that was the reason 2 out of the 3 times it made me sick. Steve told me that was normal, not to worry, that it would go away in a few hours, which it did. Eventually I quit coke because at the end of my 7 years and chasing the high and wanting to maintain it, I went through an 8 ball (snorting) in a 3 day period.
I finally reached the point, where it just wouldn't go up my nose anymore. I had no desire to suck glass dick, which was the next step. I waited 1 day and snorted a little and felt like SHIT. That was the end of my coke career. A few months passed, then I was introduced to a good friend named Crystal whose last name is Meth. The rest as they say is history.
End of cocaine chapter for yours truly. Hope this helps.