Sounds like you've done a lot of things to try and get healthy. Do you own your own place now where you can hire an indoor environmental specialist to come and help you design the structure to fit your needs? Perhaps some work around the home could improve the indoor air quality and provide you some refuge from the elements. That is especially helpful during sleep when your body tries to do most of its healing. You can look these professionals up at http://www.iaqcouncil.org
Lastly, check out the http://www.aafa.org
website for doctors that have been recognized in these areas. They may be able to direct you to a specialist in your area that can help with the physiological aspects of your problems.