Period about every two weeks, pain in lower abdomin, crampin

FIRST off.... i was two weeks late for my period so i went to a clinic and had a pregnancy test. All came back neg. so i figured i must have just had an off period because the next day i started. I then started my period two and a half weeks later. i didn't think about it much and just went on. about 2 weeks after the first day of my last period i woke up at night with this sharp pain in my right lower abdomin. I've had it before and went to the doctor about it but it wasn't appendicitis (sp?). I layed there for a little bit and when i was still i could feel where the pain was, but it wasn't actually pain. It was more like a gas bubble or something. After about 30 seconds or so it went away and i fell back asleep. I woke up in the morning to find the yet again the period had come early.... but this time it wasn't a normal period. it was sort of thick and dark. and it was more like spotting then a period. so i was planning on going to the doctor but the soonest available time wasn't until Jan of 07(called in on the 14th of dec 06) so now two weeks after that i'm getting light dizzy spells, light nausea, cramping, bloating, very tired, and i've gained about three lbs. over the past few weeks.

So basically i know i still need to see a doctor, but in the mean time does anyone have any advice?