Sleep regression for 9 month old

My baby was on a pretty good sleep schedule would nap 3 times a day about the same time each day and then would go to bed between 8-10pm and sleep in his own crib and everything. He’s going through a terrible time like going backwards and now will not sleep alone, and will not nap or go to sleep. He’s like constantly crying and freaking out and just wants to be held. I’m annoyed and tired and fed up someone help😭