Hello @stellabelle, First gratz on stopping drinking *thumbs up* 
I don't want to give advice just share what I do OK :)
What I do when I get scared of whatever, I tell my self :
Everything is fine right now in this moment, isn't it ?
This moment are the keywords.
I try to stay in the moment and not worry about stuff that is in the future.
I fail a lot LOL but that is OK, there are also many moments that I was in fear that I managed to change arround.
Sometimes I also strongly start to focus on something else and once in a while I tell my fear OK come and get me .... that sometimes helps aswell.
That is the Vulnerability you speak of I think :)

I had a social phobia for 15 years so I know what fear is :)

I hope your arm will heal soon *hugs*