I don’t know what else to do

My LO is 11 days old and is so fussy the past 2 nights/ days. He’ll sleep an hour max then scream like he’s straining to poop. He’s usually been such a good sleeper during the night and great Napper during the day. He’s not running a temp. I have tried the windi which did work for only a short relief. Ive don’t bicycle kicks, I’ve tried gas drops and gripe water which did nothing. I cut dairy out and have been eating pretty bland. All he wants is to be on the breast (eating or not) and I’m scared I’m not producing enough. Just because he wants to nurse for so long but my breasts don’t feel full when it’s time for a next feeding like they usually do. I don’t know what’s going on. He has a drs appointment tomorrow but going one more day sleepless is going to kill me. I need advice please❤️