Skynard,
Man, sorry to hear about your problems with chemo, but hang in there man, it's gonna get better. Never did that while flying, but I have been stung by a wasp while I was in the air. It got me on my hand which strated to swell to point that I couldn't feel my fingers on the sticks. I yelled for a buddy to come out and land it for me. It all worked out, but was a bit scary while it was happeing.