Quetiapine
"I've been put on Pregabalin a week ago and the psychiatrist also put me on quetiapine which I took for the first time yesterday.  After a couple of hours sleep I ended up waking with my pulse pounding in my neck and passed out for a few seconds. Managed to ring 999 and got checked out. I was ok but Doc said to stop them as she'd seen this reaction a few times. Never again"