Howdy! I DID read the whole thing. (No prob's. ;) I also write a lot, to ensure as much detail is included with my questions. See for yourself:
http://www.medhelp.org/posts/Undiagnosed-Symptoms/Updated-status/show/2034069#post_9615261 )
I can relate to your situation. ...Esp. the suggestion my symptoms are imagined. I'm a very relaxed, confident person, too, with a virtually stress-free life. In fact, my undiagnosed medical issue is about my only real stressor. There is zero chance my own symptoms were caused by stress, and everyone who knows me knows this. But it sure doesn't stop doctors from suggesting it. >_< I wonder what arbitrary excuse lazy doctors came up with before "stress" or "anxiety" became popular buzzwords?
Since developing this tricky issue, I've learned just how many people have serious, serious problems and, too often, are dismissed as imagining them. I know two women who almost died because they couldn't get doctors to believe the severity of their symptoms. A friend of a friend recently did die of the illness she couldn't convince doctors she had.
Thankfully, my ailment seems to be getting better, on its own. It's been 15 months, so far. No diagnosis yet, though. I've about given-up trying.
I have no expertise to be able to tell you what might be wrong in your case. Obtusely, some of your symptoms remind me a bit of the B6 toxicity I recently read about, here. By any chance are you taking a vitamin B supplement? Well...don't answer that. ;) I'm no expert. Just consider reading up on it.
In my own case, I've read about, and considered, many potential causes. Many share a few of my symptoms, but never most of the symptoms, and rarely the main symptoms of any one condition. I only mention that because you may discover (may have already discovered) that lots of conditions share symptoms.
I wish the very best for you. I hope you have improvement in your symptoms or, better yet, an accurate diagnosis or reversal of the condition. I'm sending good vibes your way! :)