Daz, i trained for years with heavy weights and often ended up with a bad back and other joints. My back isn't perfect but so much better than it was, i still train but not as heavy (more reps) and do more stretching than ive ever done along with more exercises to strengthen my mid section and lower back.
Unfortunately as we get older we cant do what we used to (i'm 53 now). I would say rest up until your back is feeling better and then stretch more as mentioned. Your work is more important than throwing a few weights around....
Good luck fella