...based on what I've read and heard, this really sounds like end-stage neurological symptoms of IBD. I can't actually and ethically offer you a diagnosis (not a vet, and even if I was I couldn't ethically give you one over the internet), but I can suggest that you prepare yourself for one. Unfortunately, there is no cure for IBD, and euthanasia is generally seen as the most humane option for animals in the end stages of the disease.
I highly suggest using the herp vet locator that Bogertophis shared and seeing if there are any other herp vets around you. Give them a call, tell them your boa's symptoms, your concerns about IBD, and ask to be seen as soon as possible. This is an urgent, serious matter and you should get your boa to the vet as soon as possible. If your vet does come back an IBD diagnosis, please know that this isn't your fault. A large part of the reason why IBD is as prevalent as it is within the hobby is unscrupulous breeding, the refusal of many breeders to test, and the fact that boas can be asymptomatic for years before the disease manifests. The fault isn't on you, particularly as a new keeper.
If it's any consolation, there is currently no evidence that IBD can spread to or effect dogs, cats, or humans.