HELP!!!

Mitzi
So i been feeling kind of werid and well i had my period february 28th and it last 8 days this month, so im irregular so the whole february month my period was not arriving sence the last day and before that i was throwing up and my stomach felt kind of weird as well now that i had my period and it finished already i still feel so bad, i get dizzy and then my right side pelvic is hurting constenly and i am wondering why is this happening to me? I took a pregnancy test and it came out negative.. i been TTC sence almost 3 years and no luck... CAN YOU GIRLS HELP ME!!!