Colic?

I thought Nolan was just being a cranky baby...but now I'm thinking it might be colic. It seems like he turns into a different baby around 5pm. He screams at the top of his lungs for no reason, his tummy is very tight and I think his tummy hurts. Its been taking up to two hours to get him to sleep, then he sleeps for 4-5 hours and is back up...he's easy to get to sleep this time though. Next week is his two month check-up...not that the doctor can really do anything...it will just be nice to hear he is "normal" :)