I will say both with 1 more added.
In your head you kept telling yourself to be careful of your back?? Right? If you were, you probablly wasn't concentrating on the shot as much as you would have been before the injury.
Turn the bow down about as far as it goes and just start shooting again. Or you can get some of that surgical tubing and pull it back as if you were pulling your bow back. Start exsercising those muscles and get them back in shape. You should notice a great improvement over time.....not overnight.

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