o.k. I have everything tms except back problems. go figure. Anyway, I haven't played guitar in over 15 years. I picked it up and played for 30 minutes yesterday which was a miracle in itself. This morning I awoke with a severe lower back ache. I assume from the position of holding the guitar, bending and twisting motion that I haven't done in years. will this subside soon? is this tms? or is it because my muscles did something they are not use to?