Are there any vitamins I should take if I might be an alcoholic?

Yes. Actually, the most important one is a b vitamin called thiamine, or vitamin b 1. That being said, taking a vitamin does not make up for poor overall nutrition. Thiamine can prevent problems caused by a deficiency of thiamine called wernicke-korsakoff syndrome, which is rare and also irreversible. Thus, once you have it, it does not go away. The syndrome causes severe short term memory problems.
Thiamine and B12. Excess alcohol intake typically leads to rapid loss of thiamine and b12.