"Psychosomatic symptoms...Toxic, and hypertense. Involving the eyes the ears the nose the throat. In other words, just from waiting around for a plain little band of gold...a person can develop a cold."

Its all in his mind. He starts to stress out and drive his body to the physical limits, so he starts to lose his powers. The fuzzy vision thing? I'd say that is all mental, but the glasses shouldn't have fixed it if it were. How many people have a mentally induced blindness after witnessing terrible accident?

The losing the powers thing was weird, although he shouldn't be shooting webbing from his actual wrists anyways because in the comics he made web-shooters as a technology thing.