I was camping on the east coast of Oahu in a free campground one time and met these two brothers in their 70's. One of them had some medical condition, something related to being allergic to "everything". They had tried many things, traveling all over the world, and this location, with the wind coming off the ocean, sleeping in open air, no tent, with a canvas (not plastic) tarp as cover from rain, eating only fresh local foods, was the only thing that worked for him. Who knows, if I was in your shoes, I'd try anything.