If your married don't tell your wife your back issue is bike related, she'll remember and the next time your down she'll sell the thing before you get healthy.
Backs and knees are funny objects. Every spring I begin riding and while on the bike I feel great. 2 hours later I can't get out of the recliner without sliding to knees and using my arms to help me up... I wait until my wife has left the room.
When I go out to ride the next day I scratch the plastic trying to just get the leg over the seat, and can only kick twice... fortunately the bike starts. Once into riding all is fine... then repeat the nightly process. This continues for 2-3 weeks until the whether warms and the body takes shape.
Moral of the story, don't worry about the back... go ride and don't tell the wife how you feel.
I feel your pain... hope it gets better.
