[chunky]

Assuming you aren't trolling (which sorry, if you aren't), you should seek professional help. What happened isn't your fault. Very few, if any, people on this forum are equipped to help you in the way that a professional is. If a lawsuit is in progress, you might want to become involved if monetary compensation is something you'd like. Hope the teacher gets what's coming to him.

I'm not trolling, I'm 100% serious. I honestly don't know what to do.

Well it seems to be something serious regarding the flashbacks you mentioned so I'd also advice to search some professional help as @Oni already mentioned.
Or at least talk to somebody you trust like your parents or whoever. I'm pretty sure they will support you and talking about such stuff can be very helpful just because it won't be your secret anymore.