This is very interesting since I have experience similiar. When you fly, your body gets very dehydrated. I always purchase the largest water bottle offered at the gift shop right before getting on the plane and try to drink it ALL before I land. This way, I stay hydrated and I can be sure to flush myself out once I arrive (which can help with bloating...
HI!
I just started Gluten-Free for about a month (with some minor hiccups) and for a period of time my arms cleared up completely. Granted I was on vaca and I dont know if the sun/warm weather had something to do with it. However, these next couple weeks will tell.
On a stickier note (concerning the Peanut Butter) I have removed PB from my diet...