^^ fuck keppra... shit made me pissed off, emotional, drowsy, dizzy, nauseous, and i felt like i was on the verge of the "bizzare hallucinations" at the point where i was supposed to double the dose i was taking.... All to keep me out of car accidents, kind of counter productive seeing as how i was passing out at the wheel, fighting nausea, and on someones ass going 85 down the highway while screaming at them.....
horribly expensive stuff without insurance, thank god for copay....
But an LSD flashback is not going to cause you to have a heart attack, nor is it the result of stored LSD in your spine breaking off and traveling to your brain like a trippy anyerism....
Its more of a form of post traumatic stress syndrome, or something similar to it... Psychs cause powerful respnses in the brain, many of these can be very powerfully emotional and psychological.... They leave an impact, your brain makes memories and sometimes they can be triggered.
Its honestly not as bad as the media makes it out to be for most, HPPD is a little bit more of a concern because that is persisting hallucinations. Certain locations will cause me to have tracer type visuals at night, often places that have nothing to do with psychedelic drug use. There is one camp ground that does it, and whenever i camp anywhere else it doesn't seem to happen. The only conncection i can make is my lakeside acid/kayak trip way back about a year ago....
Its all psychological.... LSD and its metabolites are pretty much all out of your system by the time your done tripping... 3 days and your not going to find anything that would be testable, much less in amounts that would cause you to trip....