Awesome. I just was trying. I don't think it's his thyroid. Thyroid problems would cause (in other animals) weight gain. The CC would help and he would gain, I believe. That test is NOT normal. I believe you are right, the vet is giving up and waiting for you to say the magic word, sleep. But I see that Sam is fighting. I see his eyes are clear and he feels your love which is helping him fight more.
chemisty is NOT normal. No yeast infection or other bacteria. I see normal metal but honestly lead poison is very sneaky. We have lead and copper in our bodies. Another thing concerns me is they are comparing guinea pig against a rabbit. Rabbits can eat thing guinea pigs cannot.