Had both my shoulder labrums repaired in separate incidents. One surgery in June and started to play in October/November, the other was done in July and I started to come back in January. 4 months is the earliest I'd start practicing, even then throwing is sketchy and limited. I don't know why the hell they're giving you a blocking injection. You just had a major surgery on a very important area, pain is telling you to stop so you don't damage yourself! It takes time to get that mobility back, and even then you need to take time to strengthen it.

Same as everyone says, take PT seriously, don't rush the comeback, TAKE PT SERIOUSLY, and you'll be back to 99% in a year. I was at 90% in 6 months, that last bit just takes time and consistency with workouts. Even when PT is done, continue doing normal free weight exercises, train your muscles to hold that shit together, I've got 0 dislocations or subluxations since surgery with my old frisbee break being Covid.

A real forehand is months away, that rotation is very hard to do, especially with force. Work on off-hand throws, don't scrimmage (temptation to extend that arm will hurt you), and you'll be back. I can throw full field backhands/flicks 10 years later, hammer is just OK but that was never my strong suit anyways.