2 year old sleep please help

Please somebody save my life. My two year old (25 months) went from sleeping 730/8pm to 7/730am, napping 3 hours during the day. Then right before he turned 2, there was sickness and 2 year molars. Ever since then (3 months 😭) he’s been waking up constantly through the night. Wakes up at 5am no matter what. And went from napping 3 hours per day to just 30min. I’m barely surviving anymore between him and working 12 hour shifts.

His rooms dark, nightlight, sound machine, regulated temp. We’ve been sitting on the floor next to his bed while he falls asleep. We even got desperate and tried cry it out but he cried for an hour and we called it quits (we also sang to him through the monitor). Please somebody give me a tip. He’s even my second kid, not my first.