Depression?

I'm a 17 year old female with depression (runs in the family and I fit with a lot of the signs). I'm not on anything currently, though my mom knows, and she is looking into alternative supplements besides anti-depressants. One thing I notice is that I'll be feeling depressed (it's not major depression, more of dysthymic disorder, aka constant state of low mood but not as severe) for several days to a few weeks, (ie not wanting to get up, feeling hopeless, just sitting and doing nothing, loosing enjoyment in my hobbies) then I'll have any where from 1-3 days of happiness then sink right back into depression. It's not bipolar, I don't get extreme happiness, more of I feel like I'll be ok. Then the happiness goes away and I feel depressed again. Is this normal? Sometimes I'll wake up feeling like everything is ok, and I'll even have a really good day, but by evening thoughts creep back into my mind.