Suggest Treatment For Severe Pain In The Area Between Testicles And Anus

Hello,I have a great amount of pain in the area between my testicles and my anus. The muscle there from about the end of my butt to the bottom of the scrotum in extremely sore and swollen. May even be some slight bruising. It hurts to walk, lay down, and sit. The only time I don't really feel anything is when I'm standing. I have no idea how this occurred. I began playing basketball on monday and wednesday of last week and I did not stretch. I just started running. I did not feel any pain afterwards. Then, on thursday afternoon I began feeling some discomfort and then beginning friday afternoon I began experiencing a lot of pain, tightness, and swelling and since then it has been a progressing or steady pain and the area is still swollen. I'm not sure what happened. Do you have any idea? Or any idea how I can get better by myself because I currently don't have the insurance to cover me and anything I can do on my own to relieve this pain will be greatly appreciated. Also, do you know what that muscle is called? I don't think its the groin because my inner thigh or the muscle that is between my leg and torso are fine. It basically feels like a pulled muscle under my scrotum and in front of my anus and on the left side of the line of skin that runs from the bottom of the scrotum toward the anus. Please Help! :)