Great hairy bollocks!!
Ooo-err. Something very similar happened to a mate of mine just before we were due to go on a fortnights holiday in Falaraki. The left one swelled to the size of a grapefruit (the right one seemed to completely disappear, probably in fright). The doctors advised him not to fly and to stay in hospital for further tests, so he discharged himself and made his way to Gatwick.
The reduced pressure in the cabin didn't help and seemed to make it swell further. Despite a lot of gin and tonic he had to plead disabled to get a special seat. I have some great photos of it, I think we dressed it up as a Russian premier one night.
H