Hi Cheryl,
I hear Sheffield does good GK and I believe (I'd really have to dig on this one) that one or 2 on the forums were treated there... will check.
I think the side affects are the same for radio, regardless if its GK, CK, FSR, Trilogy, etc.
fatigue... ear fullness... vertigo.. .balance issues... these seem to be many side affects that many have discussed here in the forums. I know you are quite versed that "individual results may vary", so not all folks are experiencing some or all of these issues... but, your doc should be sitting down with you to discuss all risks and potential side affects with radio treatments. Also, please check the Radiation Forum here... as there have been many discussions about some of these side affects.
As Gordy noted (and others here have as well) re: GK... there seems to be some that report skin issues where the head frame was anchored for treatment. Some slight scabbing or some initial numbness or such at the screw site.
I hope this helps.
Please hang in there!
Cheers!
Phyl