Which immune disorder causes difficulty walking, pins and needles, electrical shock pain,sensetivity to humidity, loosing balance, headache, weakness in right side of leg and arm, fatigue and sensation of ants running under your skin.? thanks?

Many possibilties: One possibility is Multiple Sclerosis, but this could also be Lyme disease with co-infections like Bartonella and retroviruses.But this might not be an immune disorder but heavy metal toxicity from mercury,lead or aluminum. Mold toxicity may also cause this. You should see a good neurologist but also consider seeing a good Integrative physician. See https://tinyurl.com/y8opon3c