Hello~I am so sorry you are not finding any answers. I have a couple of suggestions.
1) If there is a Naturopath in your area, make an appointment for a physical, they will usually delve deeper into the issues and try to get to the root of the cause.
2)See a chiropractor, you said some of this started when you had a car accident 8 years ago. Well, if vertebrae are out of alignment and pressing on nerves, it is very possible to experience almost all the symptoms you are having.
I hope you find some relief soon.
Dx: inflammatory process or fibromyalgia
Go to a rheumatologist.
You had allergies, so your immune system was working hard.
You may be double-jointed or you're able to over-extend your joints. You were in an accident and your joints and muscles became inflamed, and your immune system is in overdrive and it tried to heal the injury-- and this process will continue until you take something to suppress your immune system, something like Humira or prednisone. Inflammation is affecting your nervous system, so that's what you're calling "anxiety."