Still struggling with sleep 😭

Anyone else's 11 week old still struggling with sleep at night? 😭 I have hit my breaking point tonight. My LO hasn't slept longer then 1 hour and 45 min at a time tonight. Any tips? He will wake up crying and eat but won't finish a feeding and I do everything I can to wake him up but he just won't. I don't know what to do and I am so tired 😭 Anything would help at this point. He was sleeping 4 hours on his first stretch then 2/3hour stretches after that for a few days then back to this...