Why are you so hung up on your boa having IBD? Absent a blood test or necropsy there's no way to know if your animal has it or not. If you've had it living in isolation with you for months then I would suspect not.
OTOH if you do not fix your husbandry and temperatures your boa will end up getting sick. Your snake is at the size/age where you need to order a proper reptile enclosure, heated by an RHP, regulated by a thermostat, etc.
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