Hi. I have found the red cell magnesium test to be quite accurate so maybe you are not deficient in magnesium and dont need it as per your test results. However as you say this is a very odd result considering magnesium deficiency is typical in cases of M.E/C.F.S and Candidiasis. I never could tolerate tablets or capsules either (although my reactions were not as extreme as yours) but I have had much success with magnesium oil spray. My magnesium red cell levels were very very low and I know I am deficient in other vitamins and minerals too. Inspite of this I was still able to tolerate the mag. spray (without taking any other vits and mins). Of course its better if you can get a balance but its hard also for me tolerate things. I find tiny doses work better than pumping my body with larger doses. Sorry not much help really but hope you can find some answers.