Please help, can't tolerate Vitamin C

When I take Vitamin C in the form of Ester C or "regular" ascorbic acid Vitamin C pills from Costco, I feel like my brain is melting.  I know that sounds strange.  I have mercury toxicity, can anyone help me out?

Is it possible metals are being mobilized?  Or am I not taking enough, I take 1-2000Mgs.

I want to start the Cutler protocol but not sure I can if I can't take C.

HappyManatee