hope you get this reply, I took a 2 litre camel back for water and 2 x 600ml bottles my gatorade, used them all as I carried my own pack.

Hey I get a similar thing, and I am 6'1" my right arm is the arm I use for the walking stick so it is moving a bit, however my left arm just hangs there and it swells slightly and goes pale, and I guess it does get a little cold. So the movement of your arms maybe the reason. We are a strange bunch us humans lol