Andy Cutler's procol

Could someone, or Andy tell me please how does one tell the difference between the symptoms caused by too much DMSA or too long intervals between the chelation bouts? Say if I took 50 mg of DMSA every 4 hours and got dreadfully sick from this and the effects were long term, would that mean the every 4 hours may be too long in my case? Or would the 50 mg be too much? I don't react to DMSA itself, but as I'm chelating, by the second day I can be very very sick to the point of inducing tremors and nausea in the extreme, crying/salivating. I'm just curious as to why, so I can stop this happening again in future. My symptoms concentrated mainly in the brain and the intestinal tract. Little to almost no mercury level shows up on any hair test, or blood test. My mineral levels however are usually very low, especially selenium, but sodium and potassium are extremely high. (hair analysis test).