,I haven't had a menstral since Halloween. I have had headaches, some vomitting (not much), nausea after eating ( a lot but hardly ever vomitt), stomache is so sensative to touch sometimes a pair of pants feels wrong to wear. I have taken 3 home pregnancy tests, and they all come out negative. What should I do? Any suggestions to what may be causing this? Oh, I also only have one ovary.