Sounds like a growth spurt... though I wish someone would tell DS it's supposed to have stopped by now (I have him snoring on my chest right now after having grown another 3cm in 8 days). Growing is a tiring business, and appears quite painful (DS cried so much that he lost his voice... DH and I eventually took him to the doctor who told us it was "just" colic after about 14 hours of daytime screaming and gave him some Calpol). I'd have loved it if DS slept and didn't cry so much!

Do go see a professional if you're worried/scared about anything, they can only put your mind at rest.