Headlines, I have been following this thread, but since you have had plenty of good advice given, I felt no need to post. I feel the need now.
I am sad to say that I have to agree with Dawn on this, 100%. Without proper vet care, the only thing you are doing is dragging out what will end up being a very painful death. There have been no signs of improvement, and in fact, I see that his condition is turning in another direction completely.
You've done all you can for him, now you need to make the choice that all pet owners need to make at some point. You need to make the choice between quality of life and quantity; to decide if you are keeping your friend alive for yourself or for him. It sounds to me as though he needs to be relieved of his pain, and you are the only person who can do that for him.
Sometimes we try too hard to do everything we can do, because we think with our hearts instead of our heads. Without proper vet care and the right prescriptions, this poor boy is just going to continue to suffer until his body finally gives up the fight and he dies. It would be much more humane, and much more of a relief for both of you, if you took that decision upon yourself instead.