Whichever one you get, after "doing a study" 😉 I have proved flapping your arm like a chicken wing before the shot, for 10 minutes or so, majorly reduces arm pain later.
Or it was a complete coincidence. Worse case, it still stings later and you looked like you lost your mind in public.
Either way, cheers!
ETA: if I could remember the name of the PF member who "did the groundbreaking original research" I based my "study" on, I would credit them. Unfortunately, I can't remember who made the observation "hey I worked out super hard and no more arm pain doodes."