My last period was may 2,2014 and this morning when I got in the shower I started to feel cramping and noticed a little blood I figured my period was starting. When I got to work I noticed in my pad there were brown stains and when I wiped there was no sign of my period. I now have these horrible cramping/contraction feeling pains in my lower abdomen. When I sit down on the toilet, I get very hot feeling dizzy, feeling like im going to pass out but when I stand up I feel better. The very unbearable pain subsides then I start to feel this dull pain. Also my tubes have been tied for 2 years, what is the issue?