I've had similiar problems and seen to many docters for 3 years. My ana was the only thing that showed up. It looks like your docs were just guessing with your symptoms. I finally have got bllod work back from a new doc I just saw last week. Turns out my parathryoid is high along with some other thyroid thing. Get tested for this!
You have four parathyroid glands and when 1 or all are not functioning you can feel like your dying and have tons of symptoms. Your parathyroid glands regulate calcuim in your blood. If your body is not geting calcium it starts to take it from your bones. You may have had this longer than you thought. Good news though after a 30 minute surgery to remove 1 or more glands most people feel 90% better quickly. Even those who thought they had no symptoms say the feel great and like someone turned the lights on.
Read this book
living well with autoimmune disease what your docter doesn't tell you..... That you need to know. -mary j. Shomon
she also has a website.
Hope this is helpful, let me know