Bipolar or not?

I'm 17 years old and for the last two years I've been having mood swings. I go from really depressed to unusaly upbeat and energetic. I researched bipolar and I can relate to a lot of the symptoms although I've never bought anything I couldn't afford or cheated on my boyfriend while I've been in a 'good' mood.
When I'm in a 'good' mood I don't get tired, I have loads of energy, feel happy no matter what's going on in my life, I get very exciting by things only a child would find excitable, I have racing thoughts, I'm easily distracted, find it hard to concentrate.
When I'm in a 'bad' mood I find it extremely hard to get out of bed, I get angry, I have no interest in things I usually enjoy, I'm always tired, my memory is awful (this is all the time) my appetite changes.
My moods usually change numerous times a day and it's usually depressed/angry and stable moods I'm in, the 'good' moods don't happen as often.
Among these I also get very disturbing images and thoughts in my head, I don't know where these images/thoughts come from.

I went to my doctors in October they said it was normal teenage hormones but I inisted on a mental health assessment which I had on the 5th feb and that was a terrible assesment. I told him everything I posted on here but in more detail and he said there was nothing wrong with me. I'm going back to the doctors on Friday to request another assessment.

Geez, I go through this once a month and can't stand it, it must be absolutely horrible to go through this every day. I have raised teens, and this is not normal teen behavior. Go get a second opinion.