I am under depression but diagnosed with bipolar. How to confirm it?

Hello doctor,

I have been experiencing mild depression since I was a child. My family problem made me extra depressed. After three years, I fell in love with a girl, but then she left me. This created a check for me, so I wanted to study more to prove myself. The depression kept increasing, but I started to be more talkative.

I used to see the light coming outside people faces. Also, the depression stayed there. I also experienced wondering mind. There was an episode of racing thoughts once. I had to take massive, sleeping pills to sleep. In the end, a psychiatrist diagnosed me as bipolar type 2. He put me on Seroquel, but it was not sufficient. Sometimes it took the depression off, but other times the depression was still here.

My parents took me to see a psychiatrist overseas, and he also diagnosed me with bipolar. He did put me on Lithium and Abilify 10 mg. I never felt this good before. My question is, do I only have depression? And not bipolar. Lithium can help improve depression symptoms, so maybe that is the case of what is happening. If I only have depression, I should be put on antidepressants.