Get to a professional if you can. At the least, start with your primary care physician. If you talk to anyone, do your best to drop your defenses and tell all even if it is painful or embarrassing. That gives the doc his best chance of helping.
Bipolar is a tough one to nail down. A self test is not going to be as good as a professional who can listen and respond. If you are not bipolar, and assuming you are frank and honest with the psychologist/psychiatrist, they will be able to help you get it figured out.
The reason I am so big on being fully open is my own experience. I started out being treated for depression. I was put on Paxil, and over the course of the year, I became a new person... not a good person... a new person. I started out becoming very uninhibited which is not terrible in itself, but eventually I found myself in an affair. I loved attracting women. I did some big spending, I barely gave my wonderful son any attention, my house became a wreck, and I did not even open my mail, including bills. I withheld much from my psychiatrist and what he did find out from my wife I was able to mask for him and he hesitantly followed my lead.
I had huge blowups with the other woman and my wife as we worked on a divorce and in a moment of clarity, I eventually told the doctor about that. He put me on Lamictal, and over the course of about a month, gradually increased the dosage. Over that month, I started to see my home as a dark place. I saw much of what I was doing as empty. I started to recognize the damage. Most importantly, I started to acutely miss the wife I had let go so easily.
My wife and I are working on reconciling... the divorce was never finalized.
Okay... I stole your thunder a bit... sorry...
My point was just to show the depth of the potential damage if you don't do it right.
Get help. The internet can't help you the right way.
