For the past 8 days or so my bowel movements are suggesting I have some type of intestinal problem. I'm concerned because I'm seldom sick, and these things have usually cleared up in a couple of days. I went camping with a group about 25 years ago and a majority of us came down with dysentary. It was horrible for about a 24-hour period, but I was over it after 2 days. My point being that although I was younger, I've always had a very good immune system.

My questions are:
1) how concerned should I be that this is taking so long to clear up ?
2) when should I consult with my doctor ?
3) could this be an indication of something serious ?