I'm 15, i haven't had a regular period since my first period. That didn't bother me, but for the past year or two, I've been skipping my period for months (up to 5). About 7ish months ago I didn't have 'normal periods', I was spotting but there was mostly brownish discharge? That went on for a couple months. Now, I've been struggling with a constant period that's been lasting for 4 months so far. some times I'll think it's finally over, but it'll be back the next morning. The flow varies from heavy to light. 

I suspect I have pcos, but I haven't been diagnosed. I do have an appointment to do blood work soon, I'm asking that they also test for pcos. 

Is pcos causing my period problems? Does anybody have any advice?