Tear My Hair Out

So my 10 month old decided that he wants to cry all the time since Saturday.  He's fine when we hold him and stand up with him, as if he's gone back to being a 2 month old.  But when you put him down, he screams and just about throws a fit.  Man, this screaming is about to make me go insane!  I'm not sure what's going on with him.  He doesn't seem to have a tummy ache because he's eating things just as eagerly as before.  I'm not sure if he's teething and that's causing any issues.  But we've given him some Tylenol and that doesn't seem to make any difference.  So he's just now screaming for no reason it seems like.  I have just about had it.  It's days like today that makes me want to not be the mom anymore.  Enough already!!!