Feel like I can't catch a break...

My son was never a great sleeper, but a bit ago he was doing SO good. He was sleeping from 7-7 FINALLY (previously he'd be waking at 4 or 5am for the day) and I could lay him in his crib, leave the room and shut the door and he would fall asleep on his own, then the shit storm hit. His top molars started coming through. He was back to bad sleeping habits. First I had to be touching him until he fell asleep, then I graduated to just needing to be in the room shushing him when he yelled. Then it seemed like he was going through a leap. Waking up multiple times during the night and being SUPER cranky during the day. I was able to sit outside of the door with it open a crack and shushing until he fell asleep so I could close the door. Now he is in the midst of having a cold which makes him super cranky during the day and only just the other night he stopped waking up multiple times. He's back to waking up at like 5 am every morning, though. I am EXHAUSTED and irritable. My husband has stepped up the days he has off, but most of the time he had to wake up at 6:30 and go to work.