hey dude i have done this a lot to both of my shoulders. Ive done grade 3 twice. It fucking sucks and I know how painful it is so I feel for you. Basically take it real easy for like a week (like no moving it at all). Then like they guy said ^ do your physio cos it helps recovery so much.
In my opinion don't get the surgery unless you have done the rotator cuff as well cos you'll be out for the season for sure and a lot of doctors say it isn't worth it if you gonna keep skiing anyway.
With a grade 3 you're looking at about 5-6 weeks before you feel comfortable on skis again.
Sorry to hear the news due, good luck with recovery.