You maybe low in sulfur, and the eggs are providing your body with what it needs. Some people who are high in sulfur, can have issues with high sulfur foods and need to be careful. You obviousy respond well, which would indicate you'd do well including other sulfur foods also, like onions, broccoli, brussell sprouts, leek, etc.

Sulfur can indeed mobilise mercury, so some people have to watch this because it can cause symptoms and bounce the mercury around more. Yu maybe ok, because that extra sulfur may simply be providing youwith what your body is lacking. Those again who are high in sulfur, may find the extra sulfur is doing not much more than redistributing mercury, which can be risky.