You putting a chemical in your body that affects your brain.
Trying more vitamins and seeking out a diagnosis now would not be accurate to what's really going on.
As everyone's said try and get a decent amount of sober time under your belt without booze and see how you feel then.
...and when things get tough reach out to who ever you can rather than the bottle.
I've had all sorts of diagnosis', been sectioned in secure units etc.
When I'm sober i'm relatively stable. I don't currently take any medications, where as there was a time I was on about 8 + booze and a complete wreck.