Happy Baby turning into crabby Baby

That's what happened the last few days , always around 4 pm , just super fussy till he get's his Bath and food . Nothing I do makes him happy , which in turn makes me feel horible .
And the last few nights Ben hasn't sleeped that well either , waking up often and wanting to feed .
Just need to have a moan on here I guess , I'm just tired and would love to have a long sleep