Butthole feeling blown out? Weird I know

Kaicie
Ok so today after the hubby and I were intimate, I started getting little bit of back pain. I brushed it off because I figure it was from doing it on the floor. Then I got a pain in the back of my legs like they were waking up or like I sat for a long time. THEN OUT OF NOWHERE my butthole felt like it was gonna blow out or like I tooken a large one or like I did some adventurous exploring (if you know what I mean) . If I sit the pain almost goes away completely. I can stand for a couple minutes before it all floods back. WHAT CAN THIS BE? I want my butthole to feel normal again.