Hey Rabs, do you take any kind of pain reliever? That could help a great deal.
And make sure you are aware of your back thoughout the day while working. I know you do. But it is so easy, when you are feeling well, to forget about this. Keeping your back staight, trying not to bend over for too long, gripping things not too tightly are all things I often forget about when I am feeling fine. And then I pay for it later.
Perhaps find some excercises for your back as well; something you can do before and after you work in the shop.
Best of luck.