[MJo]

I've heard that shingles can be horribly painful. I'm sorry you have to deal with them. Please take care of yourself, including pain meds if necessary. I have TMJ. I clench and grind my teeth in my sleep. Your dentist can make an appliance for you. I've accidentally thrown two away, so be aware. You can also buy a cheaper product called Night Guard in the drugstore. Night grinding can cause you to wake up with piercing headaches, and of course I think it must be brain cancer.
Constant pain can certainly wear you down and make you grouchy and depressed. It helps to vent, and we're here to listen.