Aw, Gary, prayers on the way for you and JJJ3. Try not to give up yet.
My old Leonardo got down to 7 pounds before we found out he had overactive thyroid. He got on medicine and was back to 11 pounds before arthritis did him in. I had him an extra year because of the med.

Maybe JJJ3 will put on weight when he feels better and can eat better.
Prayers for you both.