I'm sorry to hear that Boo has hyperthyroidism. This is what my beloved Jack had, but sadly due to him not being diagnosed early enough...well you all know the story. He'd developed Hypertrophic Cardiomyopthy and the thickening of the walls of his heart was just too bad.
I am so glad that Boo is getting treated properly and as soon as possible so that he won't get so ill as Jack did. I am praying the tablets will make him so much better and he'll improve quickly.
I'm thinking of you Boo