I'm going to ask you to please see more various specialists before making any type of decision regarding further treatment and especially surgery. After 27 years of this nightmare, I just found out definitively that I have djd (degenerative joint disease), arthritis, of the jaws. But, I can function (24 mm opening) and the pain is controllable.
A few years ago I decided I wanted to have surgery after putting up with this for 24 years. I got on the Internet and started searching for any and all information, but particularly on a surgery that would either clean out the joint and remove the discs or fix my lower jaw (too small). I obtained a lot of information about self-helps, various medications and supplements, plus a wealth of stuff I hadn't even thought about (going to a pain doctor). I wasn't finding anyone who had been helped by surgery but scarier - I was finding people who have had repeat surgeries and most were still not being helped.
That scared me so I started seeking help with various doctors, medications, PT & MT, supplements, and all self-helps I could find. Some worked. Some didn't. I didn't give up when a pain doctor treated me like _________.

I big-time worked on stress relieving and posture corrections, and this has made all the difference in the world to me. I found out I can't work a job with high stress or that talks a lot (I was a police chief's secretary). I can live with that (or rather without that job). I have to treat my jaw like it is a handicap. But one that I can live with.
Again, I highly urge you to go to various different kinds of specialists for more opinions. Make sure to have a tomograph (x-ray) of the jaw joint if anyone is going to talk about djd. You can live without a disc or even a split disc. It may take a lot of work and frustration, but put surgery at the end of your list of things to do for your jaw. See a neuromuscular dentist. And see a Functional Joint Orthotic (FJO) dentist. And see a dentist who focuses on TMJ. And see another oral surgeon (if you must). Don't give up no matter how frustrated and painful you become. ***DO NOT*** make an emotional decision on a very emotional dysfunction. Information...Research...See a new dr...Information...Self-helps...See another new dr...Massages or physical therapy...Heat & Ice...Research...
You get my point. Sorry I wrote so much but I just had to. You honestly can do this and we will help you anyway we can, but it will take time. Plan on that right now. It took me about 9 months from when I first started searching for a pain doctor to feeling some relief from the constant 24/7 pain. And you might have to travel but you are young and you are worth it. Don't wait until you are 51 and have no energy left to travel.
Please let us know how more we can help. If you want help in finding specialists around your area, just ask. Take care.
God bless...
Carol