*EDIT* 22 month old waking at night

My boy will be 22 months this month and for the last 2-3 weeks he’s started waking up at midnight every night. Needing lots of help going back to bed. I think he is teething one of his back molars but did anyone else go through this? I get so fed up of going in his room so often to try and get him to sleep again that we result in bringing him in our bed so I can go to sleep. Anyone else go/going through this? He was a great sleeper before this. If you started co-sleeping did you have issues down the road?