Final update: The vet found that this snake had a serious respiratory infection that wasn't showing overt symptoms - the mucus membranes in his mouth were actually slightly cyanotic because he wasn't getting enough oxygen. X-rays also revealed some arthritis along his spine.
He's been doing much better, and back to his normal calm temperament, since being put on antibiotics and painkillers.
I think this is just a testament to the importance of really knowing your own snakes' behaviors, and also the importance of having, and using, a good reptile vet. Womas are known for a strong food response, and this keeper had a lot of people telling her the behavior was normal. And I admit that thought had also crossed my mind. But she knows her snake and knew something just wasn't right.
Anyway, since he is responding well to treatment, this is good news and I wanted to share!
Wow, that's a great vet you've got there, & I'm so glad you've gotten this snake some really effective help. Thanks for sharing this.
Rudeness is the weak man's imitation of strength. Eric Hoffer(1902 - 1983)