you are 43/F, a known patient of migraine
for 25 yrs. You get ear ache
in AC atmosphere which leads to headache which leads to ear pain
(vice versa). Your ear ache started in the year 2004 while you were in Canda where a chilly wind persists, now for the last 1 yr your fore arms are sensitive to atmospheric air, and painful when the fore arms are not covered even in summer.
Point no.1) Your ear pain is not related to migraine because migraine pains are unilateral either one side of head and usually it is confined with only head.
Point no. 2) as you said you get ear pain while you are in the cold
atmospheric air. This due to the sudden change or persistent stay in the cold climate producing injury
to the ear drum.
Finally if you are weak keeping your body covered give some relief overall. but the pain when not covered means - you need investigation for BP,Sugar, ECG etc., to rule out so many cause. If there is any problem in the investigations treat it accordingly. some time frequent change of position may give some relief of pain. otherwise the type of pain you feel will give some clue