ride less miles
pillow under or between knees, under neck (laying flat is awful for a tight back)
cyclobenzaprine 10-20 mg (flexeril, a mild muscle relaxant)
it sounds like you're getting in to a tightening habit that doesn't get any relief
good luck! i find 10 mg. of flexeril and 400 mg. of ibuprofen for a few nights early on in a tour keeps me from getting in to bad habits from over exercising and poor sleep.