horrible cramping

I woke up yesterday and everything was fine, got breakfast ready for the kids, started getting my breakfast ready and all the sudden started cramping REALLY bad. I was very pale, sweating, feeling like I was going to vomit or pass out. There was no bleeding or anything, just a lot of pain. I tried using the bathroom and that didn't make a difference. I was hurting all day. The really bad pain only lasted for about 45 minutes, then it was very dull and achy all day long. 

I don't know if it makes a difference, but I hadn't had sex in a couple of days, so I don't think it has anything to do with that.. 

Question is, should I be concerned? Obviously if it happens again, I'll be calling my OBGYN. I just wanted to ask yalls opinion.