Thank you for that. I found a lot via Google- a site by Pawprints and Purrs Inc Cat Health Care :
www.sniksnak.com/cathealth/hyperthyroidism2.html
and a site by The Winn Feline Foundation
http://www.winnfelinehealth.org/heal...hyroidism.html
this also has links to other pages on the same site for geriatric cats (don't like that term!).
I learned a lot and anyone facing this issue will do so too and I hope these links help them.