My W's back was bad for two years. It started for no apparent reason. At it's worst she could barely move and we're talking about a woman with a very high pain threshold. She had all the tests including MRI scan and was told that it was just wear and tear and that she had the back of a 60yr old (she was 40 at the time). Then gradually it just disappeared. We came to the conclusion that it must have been a virus. When you don't have a sore back it's easy to forget but when you have one it is on your mind 24/7. I think you will have to sit out the back problem before trying to solve the SSM. Concentrate on creating a GREAT MARRIAGE (as CeMar would say) so that when her back is better your sex life will return.
SD