Since late August I have had nausea. It comes and goes, throughout my cycle. I got my period on Monday (normal and heavy as usual) and had never had intercourse with my boyfriend. (So I shouldn't be pregnant). Just in case, I took a homemade test with things like sugar and toothpaste, and they all came out negative. Two weeks before my period, my breasts become very tender and lasts until I get my period, along with pains and abdominal cramping. When I get my period, I get regular menstural cramps, but the third day when the cramps cease, my nausea returns. I don't feel like I want to throw up, but my nausea is unsettling although I get very hungry. Around my left ovary, it has this funny feeling in it; like something is moving/ there. I was observing my stomach and there is a slight bulge around my intestines, by my bellybutton on the left side. My stomach is uneven. What is this? Is it Endometriosis or PCOS, or something else?