Debra, What more could you possibly do? If the vet couldn't help, why do you expect so much of yourself? I tube fed a collie puppy every two hours around the clock for two weeks once. (He couldn't nurse.) He did well, and then started to lose weight. The vet could not diagnose his problem, but said if he couldn't suck, give him goat's milk in a bottle and squeeze the bottle. I did that; he loved it, but died that night. My heart was broken, as yours is, but I knew I had done all that could be done for that baby. I cried for hours; when you're tired you just can't take it. You are probably exhausted. Do your best, but remember, even vets can't always diagnose internal problems in young kittens or pups. You're an angel to care for them.