I have mood swings throughout the day, and I can actually feel myself going in and out of them? I'll be extremely happy, then later, I'll shift into sad mode.  I get feelings of peace, feel loved, feel successful.  Then later I feel hopeless, unloved, neglected.  I have been diagnosed as having depression and anxiety disorder by my nurse practioner.  I don't trust her judgement because she prescribed medication without really giving any kind of diagnostic test.  I was prescribed Lexapro and Niravam.  The Lexapro didn't seem to help much, made me sick, and made me gain weight.  I just stopped taking it.  It's been so bad at times, I wanted to check myself into the hospital because I felt like I wanted to die.  I don't know what to do.  I feel like no one, not even the nurse or doctors, ever takes me seriously.  I am extremely depressed right now.  Yesterday I was really bad and isolated myself from my fiance and my family.

Summarized question: What are the treatments for extreme mood swings?