unless you have a serious form issue, i doubt yer lower back pain is shooting related.
find thee a good chiropractor, sir. i've been seeing one weekly for too many decades, to care for a chronic lower back problem. i also get massage therapy at least twice a month. getting older demands more attention to the body if you wish to continue to pursue active outdoorsmanship.
the sooner you get it attended to, the better. i also recommend not masking the problem with any manner of drugs - it's false security and can easily lead to doing the wrong thing because you little or no pain, and make matters much worse. been there, done that. a costly stupid mistake.