With this new information about the previous accidents and such, I would suggest seeking out a very good chiropractor.
I don't know if you have thought about that option or not.

But with those other accidents your spine has to have gotten misaligned.
Some MD's just don't suggest or mention Chiropractic for whatever reason.

But there are some very good ones to be found and often less costly that PT sessions.
You could just take your report & films if you have them all, and go for some evaluations to see what a chiro suggests. You don't have to allow any treatment if you aren't sure of it, or them.
Some will do an eval for free and some will work with you if no insurance.

I have thought about seeing a Chiropractor and I may just try to do that. I saw one for years when I was in high school, but I can't remember if it really even helped me. I know some people don't really "believe" in them. I don't really know. I know it does feel nice to go and get worked on, but you do always have to go back to get fixed up again. I may try to find a good reputable one here and give it a shot. I know I want one with a massage therapist for sure! Thanks for the advice.

If you have long standing issues , it does take longer in most cases to resolve or help , as the body will try to go back to the way it has been for many years..

It usually takes time to relearn the new fixed positions.

How old is your doctor? I've found that younger doctors tend to put more faith into chiropractic treatment than older ones do. That's probably because chiropractic used to thought of as "voodoo" medicine, but it's been realized that it can be very effective. Depending on the severity of your condition, it might take numerous visits before you notice results, or you may see improvement immediately. Either way, if you decide to seek out this treatment option, don't give up on it right away if you don't see positive results; it might take awhile.