Have you considered seeing a physiatrist? They generally look at the bigger picture, rather than focusing on the one thing that is a specialty. Worth a try. If you can, look up the doctors online and read their reviews. Maybe a doctor you trust would steer you to the best one.

You have quite a history. It might help the doctor if you wrote down as much of your history as you can, with any dates you remember, and the things the various doctors said about what they thought was wrong.

Sounds like you need to press on until you find a doctor you can connect with.

Jim