Well, Thimerosal is actually ethyl-mercury, not methyl-mercury...they do have different levels of toxicity.

I posted a response to your thread in the chemtrail forum, Link , but basically I experience most of the symptoms that you describe from chemtrails (burning/itchy eyes, irritated sinuses, tightness in chest, etc...) when I am exposed to many commonly used modern day chemicals (certain laundry detergents, cleaners, factory fresh plastics, etc...) , including nearly instant neurological symptoms including racing thoughts and anxiety. These symptoms do line up very closely to mercury symptoms, but really, its just how our compromised systems reacts to a variety of toxins. I have tried all of the recommended supplements for chemical sensitivity but nothing seemed to make a difference.

Its not the only explanation for the symptoms that are produced, by far. Have you ever searched for an independent lab that tests air for mercury? I'm pretty sure you have, what were your results?