Not from snowboarding but broke the neck of my scapula in a motorcycle crash and I can attest that shoulder injuries suck. Got these weird spasms in my shoulder that felt like someone sticking a burning red screw driver through my arm, wild pain. Couldn't even move my arm off my side for a month too. Hope you're healed up by now. Don't let the crash mess with your head, say f--k you to any left over pain or anxiousness and get back on the horse.