Thyroid issues

About 2 weeks ago Zoe was showing signs of a respiratory illness so Janet took her to the vet who did some tests. The forst result said that she might have FELV which is normally only transmitted from cat to cat, so we thought this very difficult to explain. However a second test was negative for that, but her thyroid function test was very high which could also explain her symptoms as well as some others that we had not taken too seriously- like occaissional vomitting. The treatments for high thyroid in cats are not very many. Our cat, Cary, who died at age 18 in 2004 was diagnosed as high thyroid at age 11 and we gave him daily doses of medication to keep it under control, but his was not a very bad case. It was difficult to always give his medication. Most cat owners know how hard it is to give pills. We found a vet and pharmact that would give the medication in a sort of paste that could be rubbed in his ear and then the medication was absorbed through his skin. It seemed to work pretty well, but was tedious.
Another alternative that was starting the gain favor back when Cary was diagnosed was radiation treatment- very much like in humans. We were a little wary of that at the time.
In Zoe's case, the thyroid function values is very high- indicating a more serious problem than Cary had so we decided to have the radiation treatment. She went to a vet on Tuesday the 22nd of Nov. to have a screening test done and then injection of radioactive iodine. She has to stay at the vet for at least a week until the radiation levels come down and then we have to keep her at a little distance for another 2 weeks or so after she comes home.
The vet has webcams set up so the owners can watch the cats from home and we have checked on here many times over the past 2 days. We are sure that she feels quite anxious being in a strange place without her family around, but hope that tshe will be much better for the long term after her treatment.