As far as trying to feed him since he may appear weak, try rubbing the food up against his mouth or dropping it right in front of him. Since they are ambush predators they will appear 'lazy' to people who think they should be moving more to catch their food. In his state of health, you really need to be helping him during feeding. Not at the point of force feeding it to him though - if he doesn't want it then try again tomorrow. He'll become even more stressed if you're agitating him too much trying to get him to feed. Doesn't seem like his stress came from environmental factors (Improper husbandry) - in your situation it's more than likely from profuse human exposure.