Yesterday his glucose level was finally just where his vet wanted it. We agreed that weekly visits were no longer required and set up a next visit on September.
Today when I came from work he was all limb. He couldn't stay up or sit and he had had accidents. I called his vet and he told me to give honey (i.e. pure sugar) to him which I should have done in the first place. (OK, I panicked). It didn't seem to help so we hurried to the vet for a blood work and examination.
He was slowly recovering but the bloodwork revealed his creatinine level is elevated indicating possible kidney failure!
Please pray for him. He is estimated to be 5-11 (!) years old. It is not his time yet.