Calling the clinic where the one vet used to work and asking if another reptile vet is on staff isn't a bad idea. Worst case they say "no," best case they may be able to connect you with someone. Sometimes there are good exotic vets that just haven't made it to the ARAV registry/finder yet. I wish I could offer more advise on the vet front, but I can't.
As Bogertophis said, there's a chance that crop dusting, cleaners, or plant oils (specifically those from cedar, pine, and similarly fragrant woods) could be at fault here. Snakes have developed neurological symptoms from overexposure to pine products in the past, and breathing in cleaners and whatever they dust on crops just isn't good for anything. Certain anti-flea products (including the ones repurposed to fight mites) have also caused issues. The wonderful Allison Theus (AKA Crispysnakes) shared a good write-up on No-Pest Strips a little while back; she's also a good resource for IBD-related stuff.
If it's any more consolation, you seem like a well-educated keeper who's been doing a good job by your boa. It sounds like he's had a good life with you -- however brief it's been -- and you should be proud of that. Feel free to PM me if you feel the need.
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