T.C.
Doesn't sound like hormonal or PMS. I suffer on and off from depression and all the symptoms you are discussing are symptoms that lead me to talk to a doctor. I'd try your family doc first and let him recommend a therapist. It's been my experience that often a good talk therapist can help with moderate depression with out taking the next step which is an antidepressant drug like Lexapro or something. I've had Endo too and the pain over years and years lead to some of my depression so don't discount that even tough the pain is gone for now. Also getting your tubes tied is pretty major since it's basically making the choice to not have any more kids and a young age. Obviously I don't have all the info so shouldn't guess at a prognosis for you but I do suggest you talk to your family Doc!
Good luck.