I am all tooo familiar with back issues, and all I can say is No two people suffer the same but they all suffer. Just out of curiosity were you bending over the bike in a cold garage? If so you may have caught a cold in the muscles and they are never fun, just pretty much got to ride it out, as in my experience there isn't much you can do about it. Despite your circumstance I wish you a Happy belated birthday and a quick recovery. As far as #2 goes trust me your not going to like it, Sorry
Just had a thought while your wife had you down on the floor sawing the helmet off your head ....You don't suppose she may have sneaked in a few back and rib shots with her knee, Do you.