Irritability, Agitation, Mood-Swing.

Dear Doc, I am not able to diagnose if something is wrong with me. Since it is related to nervous system problems, I was planning on getting Vit B12 checked. Correct me if I am wrong. Also guide me what could be the problem. I don't know if this is because of PMS, B12 deficiency or Dysphoria. I want to identify the issue so that i can go for appropriate treatment I am currently undergoing relationship problems, family issues and career issues. This is causing a great deal of stress and there is no one person with whom I can share all my issues. I share some issues with mom, some with my boy-friend and some with friends. I felt i should take psychotherapy so that i can explain some third person what is causing me stress and what kind of medication, dietary changes or lifestyle changes could help me Please help me out Thanks in Advance