Any sugestions?

C
Hi guys! I had a D&C 2 months ago. My first period after was 5 days long and 2 days spotting after. My periods are always super heavy and 7 days long. This month I started my period saturday. I had a light period for almost 2 days. Since then nothing exept nausea, today I vomited twice. Yesterday I started crying bacause my breast were so painful. I took 3 pregnancy test they came out negative. So if this symptoms are not caused by pregnancy what else can cause them? Thank you ladies!