While until your lower back injury heals.....I hope this could help you.
Flex your abs tight whenever you are going to do things which make your back hurts,
like getting up from sitting position, it may ease the pain tremendously.
*This also works for usual lower back sourness after a heavy row, deadlift or squat session.
Remember I told you to flex, not to strain, don't make a mistake here.

j/k
Good luck!
