What do you think is wrong with me?

First I realize that most of you aren't Doctors or even experts and that I definitely should see a doctor but maybe someone has gone through something similar. To start my whole life I have always had normal periods , always on time, always last your typical 5 days and so on. The last few months I have been getting sick around my period like migraines and diarrhea. This month I was 7 days late. I was sick two days ago I had the migrain and diarrhea but only lasted the day but I have been gasey and burbing gross smelling burps. I have also been tired and thirsty. Any ideas?
What do you think is wrong with me?
Post Opinion