The improvement you've seen since cutting out dairy may be due to the observation that dairy prevents mercury from being excreted from the body. This information surfaced via not directly related to this subject.

It is not known why dairy has this effect.

Clogging of the ears may take place because of the increased number of red blood cells that die. This causes increased ear excretions and may clog the ear.

This is why people with mercury toxicity may experience more ear "wax" than normal.