I did my research regarding your skin condition in your legs, my best guess is that it is guttate psoriasis https://en.wikipedia.org/wiki/Guttate_psoriasis
As per your other symptoms that western traditional developed countries doctors cant seem to explain, what I would do if I were you is take a trip to, of all places, Cuba. They have the best holistically trained doctors in the world, and they are not interested in selling you anything, my guess is that if you go there for a while and have the best doctors there take a look at you you will go out with the answer.