I need some actual input. Tmi?

I was a day late, and then I spotted for 5 days. Mostly when I wiped, and then some on a pantyliner. Brown/pink. That was 2 weeks ago. I've tested, they're negative. And that's fine. But now I'm getting random dizzy spells, I can't eat much of anything (the smallest thing makes me feel full for some reason), I've been pretty nauseous, and I've been getting dull cramps.

I'm not looking for "AF sorry" or anything like that, I'm wondering why my body is changing so much right now. I'm not under any (abnormal) stress, nothing has changed. I'll be calling a doctor tomorrow, and also buying another test just to be sure, but has anyone else experienced this?