I don't know about the new RC's that have popped into the mainstream in the past 5-6years, but LSD is the only thing that gave me that chaotic thinking process on a loudspeaker. My ears would hurt my thoughts were so loud sometimes. If you know it's LSD for sure, go big, but I am one of those who laughs at the idea of 3-5 modern hits being a heavy dose, lol(see)...
I tend to would panic without experiencing visuals. Waiting or wondering what's going to happen, after already knowing what to expect, got to me, and after a while, I learned not to expect anything. This can happen to anyone with experience as well...I had a few occasions similar. LSD is weird, and it's really not something someone can give advise for, other than don't mix certain chemicals with it and just sit back and hold on. I'm rather surprised people didn't go rampant on the fact it wasn't LSD, but I suppose that is due to the types of posters getting to the topic first.
Just remember: you're not going to die, you can't fly, you will come down, and have fun. A roller coaster might always seem scary in the beginning, but at the end, if you didn't let go, you'll regret not being able to enjoy it. Unless you're just crazy, but you would've already have learned that on a low dose...maybe.