Help?! Tmi.

Breanna
started bleeding Sunday, February 28th, it was kinda early for me, I usually have a 29-32 day period, but thought maybe my cycle was off and it was 26 this month, normally I shouldn't of started until Friday give or take a few days. As it continued it was extremely light, I usually change my tampon about 6-7 times a day at first and slow down to 3-4 at the end but if wasn't at risk for infection, etc. could wear one a day, or one the entire period.  It lasted until Tuesday, then I was done bleeding all together. Then yesterday I started feeling nauseated, having hot flashes, and having cramping. Today I wake up and experience this. Any suggestions?? I have taken tests, they are all negative.