Sleep advice!!!

A

My son will be 9 months on the 8th. Prior to leap 6/teething he would put himself to sleep at night and sleep 11 hours straight. According to the wonder weeks app he should be out of leap 6 however he seems to just be getting worse. He does not put himself to sleep anymore, I have to rock him and he is awake every 3-4 hours screaming and hysterical crying. Is anyone else going through this and will he ever go back to sleeping through the night now??