Nobody can say if you will have lasting symptoms or relapses. You will likely need to make some permanent lifestyle changes if you want to avoid the roller coaster. Repeating past behaviors will likely make those roller coaster downs much worse.

Feeling totally messed up after drinking is very common to PCS. The PCS brain has a very sensitive chemical tolerance.

I hope you can find the strength and support to stay clean and sober. It may require finding a new group of friends to socialize with.

My best to you.