It doesn't sound like meth, but then we A's are known for abusing other drugs. It could be depression.
However, as everyone has already pointed out, the issue is, what is acceptable to you? Yes, addiction throws in the question of "using or not?" but it doesn't take away the addicts responsibility of their behavior. Even when we (yes, I'm an RA) are clean, we don't get to stop being responsible for our behavior. Just because we're clean, doesn't mean we don't have to do our part.
Hugs and prayers!
Amy