How long ago did you have the surgery? You sound like my mother when she went through the same thing. First she had a partial hysterectomy then she needed a full. They most likely left your ovaries due to your age. So young to be going through this, but life takes us on our own journeys.
My mom went crazy and it was because her body was just out of whack. It took, by trial and error, matching her with the right combination of medication (she was also an insomniac). Later on she finds out she has fibromyalgia and a whole other set of trials and errors with her medications. It was awful to watch her go through this rollercoaster of emotions, but in the end it took her getting second opinions to straighten her out.
When it comes to something that can dramatically change your life... ALWAYS get a second opinion. Doctors are not equal in knowledge. Some know more about a paticular subject because they have been exposed to it whether it be personally or not, and obviously there are the ones who specialize in just one area. They are human too and unfortunately can make mistakes, but we pray the mistakes aren't made on us.
If you believe in your heart that you're not bi-polar go to your primary doctor and have those tests done. You sound normal to me which might sound weird to you, but I saw my mom go through this first hand and she is back to the person she was before her surgeries, if not full of life more.
I hope you get your questions answered soon. Keep your chin up and ask for lots of hugs from your family... sounds a little funny, but it really does help. You end up letting go of what you wanted to scream about.