An alter or split is not usually diagnosed when substances are involved. But many ppl do have an addict alter. Also " simple splits" meaning having a personality that is usually the "flip side" of your daily self is common in BP and many PDs. If you are dual diagnosed and this "persona" comes out at times you are sober and even if you are somewhat aware of what's going on but feel like you are stuck watching yourself act in a way you normally wouldn't and can't regain control even when attempting to... that is some ppls experiences of a "split alter" It is a form of dissociation but is generally regarded as an extreme symptom of a mod/per. Disorder...but then again CPTSD is not considered a DD, but can be very simular to DDNOS. .. so categories shmatagories! What's most important is that you talk to someone about your drinking and try to regain control cuz regardless of the cause blackouts or DA can be extremely dangerous! Goodluck and GodSpeed!