Sometimes I feel like it never stops.
When you try and fix one issue, that issue can then cause another problem!
I hope he is over the side effect and everything is back to normal at your home. And I hope he is eating after all of this
Siamese are also vocal, but Yoyo is pretty quiet, he only decides to be vocal during the early hours of the morning. He is used to free feeding and since he was diagnosed in Nov 2019 I immediately removed his food and started to feed him wet food at certain times of the day. Of course during the night is when he liked to eat and I took away his enjoyment. So now when he cries during the night I feed him boiled chicken and he loves it. He would have never ate boiled chicken before this all started but go figure! So hopefully I brought him back some enjoyment

I hate depriving him but it is for his health.