Hi, ZenLifter.
Sorry about your back.
Though self-pity doesn't make any good, some self-compassion won't hurt.
You are in early sobriety which is tough in itself, and now you strained your back which brings pain and takes away one of the most powerful allies when dealing with urges - workouts.
There is time for everything - for manning up, and for taking good care of yourself.
I'd say - don't try to "choke it all back" - let negative emotions out. Set a deadline. Make a plan for back healing and recovery, and list your triggers and tools to deal with urges. Post at SR. Do some meditation. Chat with other folks who suffer from all kinds of gym injuries - what do they do and how to resume workouts after.
Totally understand about licking the wounds in private - but SR is a safe place.
Keep posting)