Like TL, I do not have a severe tmj damage as you do but I am in the same boat suffering from tmj muscle spasms and tmj pains and other symptoms since my bite was completely messed up during dental work, for 9 years now. Since 2006 I am practically on all blended food so I understand very well how it feels.
I want to suggest a Vita-Mix. I can't thank it enough. It's expensive but for me it is well worth it: I am using it several times a day. You can blend spinach with avocado, cucumbers, celery, parsley, etc. or make it red: raw carrots, red peppers, tomatoes, etc. Or make sprouted hummus in a few seconds. Just don't mix greens with reds as it won't look very appealing

(still might taste pretty good).
You can blend practically anything and then fry like patties, can make ice-creams (frozen bananas, fruit with soy milk or silken tofu). At least you might feel better emotionally if you won't be too bored eating the same stuff. On better nutrition your body will have more energy to recover from what it can.
Do you know what is specifically with your tmj's? One disk damaged or two? As I know there are people with the disks completely gone and the jaw can still function, and w/o pain. So it's not the end of the world.
I'd suggest also to find a dentist trained in occlusion and tmj (not only a tmj surgeon). They can check if your occlusion is constantly adding to the jaw damage and your overall condition.
From my experience with tmj pains I learned that everything that makes the muscles relax and makes you relaxed and calm is beneficial. Try to have the time to do nothing and just focus on yourself and your body. Breathe, really do nothing and try to have positive thoughts no matter how difficult it seems. Use the action of meds to help you take some control over the situation and try to listen to your body. Ask what it will tell you. Would like to hear from you soon.