I have got a swelling at the beginning of my butt crack. And it's painful and it seems a like a knot has formed there. Whenever I bend/ lay on my bed or get up from any sitting position my head starts spinning for few seconds. I started living in a hostel from last month and the mattress isn't good plus it's an iron bed. What should I do to get relieved from this pain? I'm not able to sleep on my back nor sleep properly.