Fourth week of nausea, heartburn, and all around yuck.

Ladies, I cannot for the life of me figure this out. I have been feeling absolutely awful since ovulation time and it's been weeks of nonstop nausea, heartburn, darkened extra sensitive nipples, the taste of pennies in my mouth, and wicked cravings for things I hate (peeps candy). Now, I chalked it up to pms and was all calm about it until I started very light spotting four days before my scheduled period and had no discomfort or abdominal cramping. Normally, when I start spotting about an hour goes by and I am curled up in a ball crying because the cramps begin and shoot pain down my left leg. I did not have any cramps until two days ago and the bleeding is still spotting light. I can't afford to go to the doctors right now. Usually once the actual period symptoms show up, any other symptoms subside. I can't take this all day nausea and heartburn. I hope it's just my body being stupid. I hope it's not anything serious. All opinions welcome and thanks.