5 month old still does not sleep..

Leigh

We have been having this problem from the beginning. He will not sleep in his crib and is almost too big for his bassinet. He has been teething for over a month now but I know that doesn't have much to do with it since he's always been a poor sleeper...we have tried everything...and I mean EVERYTHING and nothing works or helps. I'm at my wits end and feel as if I'm going to go crazy. He barely naps as well so I know he's overtired. Anyone still having an issue similar? He has also started to scream very loud so I'm not sure what is going on...