Feels like my period is in my ass wtf

So recently. A couple days ago I woke up my stomach HURTING SO BAD like my regular PERIOD CRAMPS. Only to find out I don't have my period but I had been cramping like that for 3 days. Anyway so it stopped and now my BUTTHOLE HURTS!!! It's like my period CRAMPS ARE IN MY ASS. Sometimes I can't even shit because of it , I don't even need to shit right now and my butthole is hurting. You know when ur vagina hurts??? It doesnt hurt but like when you're on this period you have this heavy metal feeling or something , like ur vagina is falling ??? That's how it is in my butt. Also my discharge or my butt smelled like burnt onions or some thing??? It's happened before but NEVER MY BUTTHOLE HURTING. What tf is this???

*i am not pregnant I've been getting my period *