the 3-day delay and then getting worse from removal is absolutely normal, and it has nothing to do with exposure during removal. The 3 days is simply the time it takes for mercury to vanish (or lower greatly) from bloodstream, and the neutrophils of your immune system gets activated. They will start to attack at least the yeast, and you should get unpleasant reactions for months to come.

My kidneys also started hurting after removal, its the yeast debris and destroyed bacterias etc. that gives you also a foamy salivation and foamy urine. In this case, to spare your kidneys, you may need to stop taking any supplements like C vit and glutathione as they increase the rate of killing. My kidneys started hurting more after taking more C vit. I never got to the point where I would have found out how to treat my kidneys before the pain was gone, but I have heard that potassium citrate may help, as the reason for hurting kidneys may simply be a low pH.
In any case if you still got amalgams, dont remove them all at once, as the effect of activating your immune system is better done with thresholding, little at time.