Over the past two days, this has been occurring. I suppose the best way to describe is a severely painful spasm in what I can only guess to be my rectum. I'm fairly certain that's where it is. It lasts for about ten seconds, which may not seem long, but with how much it hurts.. My whole body tenses up, by my reaction to the pain, and as it gets worse I get slightly lightheaded, which I believe is my body's response to the pain. Also, even when the spasms aren't occurring, when I cough and sometimes when I laugh it hurts with a similar but not nearly as severe pain. It hurts to stand, stand up, and sit. I don't know what to do and if it's somethign that will pass soon,I won't bother with seeing a doctor. But, otherwise, I'll have to because I can't stand this.What do you think it might be?