Tracer, a back is like a rubber band, there wil always be a weak spot in it if you hurt it, but that doesn't stop you from a normal life. I have read that 80% of the population will experience a back injury in their lives, most heal and go on. Some don't.
I know of a lot of people who have had fusion, two level, and have gone back to a normal life, same with knees, hips, arms, wrists, etc.
You just need to build up your core and let your core muscles carry you instead of your back. Back usually become injured because of weak core muscles. It is like a wake up call to work out and to learn new ways of moving.
I have arthritis in L3/L4. I now move completely differently than I ever did before. I had to learn the correct way to move.
There is hope.