Every Sunday I walk 11 miles with my wife, and for a year now, I've been feeling this pain right after I finish this long walk. The pain is internal around the anal area. I've touched around to see if I feel something, but I don't feel any pain or bulging. When I lift a leg I feel the pain, when I'm in bed and lift a leg to turn around or get out of bed I feel the pain. The pain ONLY appears after this kind of exercise. What is it? What can I take?