Sorry for that terrible experience!

I think we have to be careful assuming wild caught animals are more likely to carry debilitating or dangerous parasites. In this case, we learn just the opposite, after all. Parasites are probably more likely to concentrate to dangerous levels in captive breeding situations - at least in those without impeccable attention to cleanliness. And captive born snakes may not have the natural bacteria and other microbes that animals (like humans) need to keep a healthy balance of gut microbes.

Many of the wild caught and sickly animals in the pet trade have been kept in deplorable conditions, either in their native country awaiting export, or at the importers facilities. Diseases can accumulate and be transmitted, while extremely stressful conditions lower immunity.

But I don't see any reason to think wild caught is more likely to carry dangerous or debilitating parasite loads if they are carefully collected, kept as stress free as possible and housed in proper enclosures. The possible exception are species that don't adapt well to captivity and so are severely stressed simply by being caught and caged.