What they don't tell people on pain pills/prescription meds is that you can have kidney and/or liver failure from them. This happens more often than you'd think! People who pop a motrin or advil twice a day for years will likely have complete kidney failure later on. It will happen very quickly and you'll be on dialysis for the short amount of time you have left to live. If you are lucky you might find a transplant.

I will be on my 8th round of DMSA very soon and I am doing really well. Hair is growing back, so that is a huge indicator for me.

As for dividing up capsules, you do exactly what you just said. Now TAKE IT SLOW. Don't try to handle 20mg of DMSA, do 10mg for a few rounds. If that is took much then cut that in half. There is no right amount of DMSA to take and everyone is different. If you are taking DMSA and feel like you need to die or go to the ER, then you are taking too much. Your body is being overloaded with mercury too fast and can't excrete it fast enough. Just make sure you are drinking water to flush out the mercury. If you aren't urinating, then you aren't excreting the mercury.