Hi there...
I've had symptoms of depression since I was in the 5th grade, when I changed schools and was so tired that I went to the nurse's office on a daily basis so I could sleep... Didn't realize then that it was depression, but hindsight is always 20/20.
I also have bi polar symptoms.
When i'm on a high time, (usually lasts several days), I talk non-stop, shop like a madwoman (of course everything looks amazing on me until a few days later when i'm back at 'normal' level)...
When i'm down i'm angry... I don't get sad, I get pissed off and angry at the world, like I have no control over my life and just want to say "f it" to the world. This almost cost me my job.
I went to a therapist and psychiatrist and got on meds that helped, along with some behavior mod therapy... Writing in a daily journal was imperative... I could see my thoughts in writing... Even the penmanship changed from day to day, it was a real eye opener.
Find yourself a good therapist and start a journal...
It can't do much harm, good luck.