The membrane is used in buildings to place under concrete floors to prevent dampness rising. It comes in huge sheets that when unrolled and unfolded cover huge areas for very little cost.
This could be used to construct a tent to avoid high levels of humidity, much the same as an oxygen tent keeps the air inside enriched, this proposed tent could keep the moisture out with a dehumidifier inside. Obviously a small vent is required to maintain the oxygenation of the lungs so it don't have to be perfectly air tight.
Given the severity of your condition and the lack of choices left to you it is worth considering.
Another alternative would be a mobile home used to provide a reasonably sealed environment, perhaps one could be borrowed / hired from a friend? A dehumidifier and an inclined bed are an excellent combination. Pauline Phelps was first to experience the combined benefits, noting dropped foot was not present in the mornings and present when she omitted using the dehumidifier.
Humidity has long been know to cause problems for people with ms. River valley areas and coastal areas away from the equator have high levels of people with ms.
My research began with an understanding of how trees raise water by evaporating pure water from the leaf, which mush concentrate the sap inside the leaf given the leaf produces sugars from Co2 and the sap delivered to the leaf contains dissolved soils and nutrients.
The lungs must operate on the same rules and given that the lungs are warmer than the leaves of a tree and warm air contains more moisture than cooler air so providing the humidity in the atmosphere is favourable to a net water loss, gravity can induce a beneficial affect on circulation, providing of course we are not flat.
However, when humidity is high in the air we breath in, the net concentration affect becomes compromised as we breath in almost as much water as we breath out. When this happens lethargy is rapidly encountered by people who are in good health and fitness, draining their energy.
Having worked in a river valley area doing heavy manual work, I experienced at first hand the effects of high humidity. In fact the area Buckfastleigh in Devon is renowned for a mass exodus when this atmospheric change takes place. The locals even gave it a name "Buckfastitis"
That day for me was an amazing revelation because as soon as we left the area to higher ground we came back to life and was able to complete the work unloading at a more elevated location. On talking to the people that moved out from Buckfastleigh, they confirmed that it was these life-draining days of high humidity that made it impossible to live there.
Cot deaths are also much higher than the national averages in river valley areas Source: Leslie Munro http://edmi.parliament.uk/EDMi/EDMDetai ... EDMID=9758
Leslie Munro did a statistical analysis of sudden infant deaths in river valley and low lying coastal areas. What he found was that the prevalence of cot deaths was way over the National average. Munro attributed this to water winter-logged soils. The Foundation for Sudden Infant Deaths ignored his research.
People drown on ventilators in intensive care units frequently because the humidity of the air is set far too high!
Respiratory infections generally follow poor removal of fluids from the lungs. When the body temperature drops by 2 degrees during the night around 4.30am sleeping flat, clearing fluid from the lungs becomes more difficult. This is around the time that sudden deaths take place, particularly in the elderly population. Obviously this time will alter when people go to bed earlier or later.
People with multiple sclerosis have relapses while showering or taking a hot bath
A team of elite soldiers abseiled down a waterfall into a high humidity valley in Borneo and found that all of their energy was sapped from them within minutes. They struggled for days to drag themselves out of the ravine and thought they were never going to make it out of there alive.
A questionnaire sent to people with multiple sclerosis revealed that high humidity was the worst environment for them to be in.
Tropical diseases, particularly in river valley high humidity areas are more common than diseases in moderate humidity areas. Two studies in the Rhone valley and another valley revealed that these areas had far higher levels of M.S than the national average.