Congratulations on 1 month and 4 days, and be very proud of your house.
It's not uncommon to find new aches, pains, etc in early recovery because I think that we ignore a lot of signs and signals while we are drinking.
Have you tried any yoga exercises? There might be some gentle yoga exercises that you could do to keep you feeling more limber while you have the back pain. Or are you able to get out and walk? That might help you to feel better too.