I am not sure about a dual diagnosis, but I do know that when the alcohol leaves the system, it doesn't necessarily take all the other emotional crap with it! I've read a lot lately about physical sobriety vs. emotional sobriety, and they are two very different places to live!
Either way - mental illness or just lack of any other kind of coping/life skills - a couple weeks sober is still very early.
Hang in there, 10X!
~T