Joe, my prayers are with ya...I would have posted earlier but wanted to check me facts first...
I have a friend who rescued a boxer from the pound that was severely abused/neglected. She had a terrible bout of Heart Worms along with being malnourished and other ailments. He said that when he rescued her, she was nothing but skin and bones.
Well, he has a happy story...I just asked him last night how his dog was doing and he gladly reported that all of the heart worms are gone and she has put on all of the weight that she is suppose to. He said that she is now energetic and a happy dog.
I do not know what the treatments that she had to undergo were, but they worked...
I have put down cats, dogs and horses before and I know just how hard a decision that is. I think that if your Vet thinks that the treatments will work, I'd say go for it. It sucks loosing a 4 legged family member, just my 2-cents...