I think probably most of your health issues have to do with the Arizona
heat. The
rash and your higher body temperature, that's probably from the heat. Use mild soaps with laundry & bathing and rinse well, generally wear clothes that are 100 percent cotton, and use a little baby powder at the neck, to minimize chaffing. A lot of Southwesterners wear a bandana to soak up neck heat and wipe off their brow. But heat alone will sometimes cause a rash.