TOTH Sorry to hear of your excruciating pain; please go get yourself checked out and don't think it will all go away. I woke up one morning about a year and a half ago with the worst neck pain imaginable, I couldn't think of anything I had done but was in so much pain I really didn't care. When I went to the chiropractor he said I have a bulged disk in my neck; I said "what? I didn't do anything to hurt myself", he said, "sometimes things like this lay under the surface for along time and then just pop up out of nowhere".
I'm also sorry you had to deal with your evil-MIL (again); you can bet there was another reason she dumped your dad's appointment on you, besides tract work. Either there's something' else going on, on the down low, or she just wanted to be an evil bitch and make you suffer by hauling your pain ridden body out to take care of your father. Witlesses love to profess, “the Bible says to take care of one another”, however when it comes to dumping infirm one's on unbelieving family to further their interests then magically it's ok. WTF!
Enough of that.
Hope you feel better soon.