I would seriously consider having a tracheal wash or lung biopsy performed so that you know exactly what you and your boy are fighting. The dog with blasto is usually running a very high fever of over 104.
Here are some sites of interest:
Blastomycosis
Tracheal Wash/Lung Aspirate
It sounds like you are doing everything you can for your boy. Treatment can and should last 2 or more months if it is indeed blasto. Intraconazole is the first line treatment for this fungal infection. Keep an eye on that liver with the combination of 2 antifungals. Make sure he continues to eat and keep him as comfortable as possible. A week after starting medications a repeat xray should be performed to look for any changes. I would consider taking on every week or at least every other week to look for improvements. Keep that baby eating and if he stops eating for 24 hours he needs to be started on IV fluids and have his liver enzymes evaluated.
Please let me know if I can be of further assistance.
Theresa
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