last night I was at the Phish show in Amherst, I ate 15 mg of 4 aco dmt right before going through security. The trip was going beautifully until, during Divided Sky, I felt extremely light headed and dizzy. I sat down and tried to drink some water, but the next thing I knew I was on the floor with an EMT in my face telling me I just had a seizure. I was extremely disoriented and could barely move, the EMTs basically carried me down the stairs. But once I got out into the brightly lit hallway I regained my sense (well, as much as I could regain while tripping). I got back into the show after they took my blood pressure and listened to my heart and breathing. My energy was completely gone though, I sat for the rest of the show.
How concerned should I be? should I avoid tripping at shows with strobe lights/trippy light shows? avoid aco dmt entirely?
I have previously used shrooms, acid, 2ci and salvia with no negative reactions. I have taken 4 aco dmt 5 or 6 times prior, all at higher doses, with no adverse reactions. I do not use stimulants (aside from rare use of caffeine).
Saturday night I did take MDA for the first time, around 250 mg over the course of the night.
Sorry to hear about that man. I know a number of PEA psychedelics lower seizure threshold, & so i suppose its possible the MDA did play a role, as thats a pretty large dose. Knew there was a lot of MDA on that scene this fall, had a bunch of friends take it a couple weeks ago, didn't indulge myself though, as I was on ~40mg 4-AcO-DMT one night & a 2C-D & M1 combo the next. None of them had any problems, but YMMV as always.
If I were to venture a guess, and I'm no doctor, I'd say that the MDA either lowered your seizure threshold and/or your body & brain were a bit worn out & nutrient starved from a high dose psychedelic amphetamine experience & the badassness of Divided Sky & the sick light show shook something loose in the ol' noggin

. Flashing lights have been known to cause or elicit seizures, so the drugs could be unrelated, but I kinda doubt they had nothing to do with it, if you did indeed have a seizure.
Did the people around you see you seize or did you just fall & everyone assumed you had a seizure? You could've just passed out from things like dehydration etc, especially after taking a quarter gram of MDA the night before, and the otherwise general drain on your body & mind from going to a few shows.
Funny random sidenote, I took my girlfriend, who was psychedelic naive & unfamiliar with that genre of music until we started dating, to a show not that long ago and in regards to the light show she asked if people have seizures from them very often.