I know all to well what you are referring too. I have had RSD for over 10 years now. It took some time to figure out what it was exactly, that would put me horizontal suddenly. Barometric pressure changes, specifically drops.....Are the WORST!!! I can feel great today, then a drop in pressure and a bit of moisture, and I am HIT!!! For Me, I was in a bad car accident at work, and suffered spinal cord & Ulna nerve damage. So, I also deal with a great deal of arthritis as well, which is without question affected by weather.