Generally people are not allergic to reptiles (but I guess it couldn't be impossible). The main concern with snakes (and other reptiles and amphibians) is zoonotic infections and diseases. Zoonotic diseases/infections are those diseases/infections that are transmittable to different species, namely from our pets to us humans. There's a pretty good article that goes over some conerns regarding zoonotic conditions that our reptiles can pass to us here:
http://www.exoticpetvet.net/reptile/zoonoses.html
Unfortunately your symptoms don't sound like they are related to any of the diseases listed, but it's still good for reptile keepers to be aware of these things as they can be pretty deadly to us (especially kids). This is why it's such a good idea to wash our hands after handling our reptiles and have high standards of disinfection and sanitation.
I hope your endoscopy went well, and you have some favorable answers to your concerning symptoms.
Truly,
A Certified Veterinary Technician with a fascination for zoonoses and parasites!
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