Primary focal hyperhidrosis does not cause illness. Basically, you just sweat excessively. Although it is a medical condition, it's not a sign of disease or a drug interaction. People who have it are otherwise healthy. The symptoms of primary focal hyperhidrosis are fairly specific.
Potassium iodide is a component in the electrolyte of dye sensitized solar cells (DSSC) along with iodine. Potassium iodine finds its most important applications in organic synthesis mainly in the preparation of aryl iodides in the Sandmeyer reaction, starting from aryl amines.
Potassium iodide is the main way that iodine is supplied; to make it, you would need elemental iodine or an iodate (or an organic iodide, etc.), which are usually harder to get than KI is. Don't buy the pills though; these contain binders, fillers, and other chemicals. Look for a small sample of pure KI. I would try eBay... As for concentrating H2O2, it is difficult. 30% isn't saturated though; I'm pretty sure hydrogen peroxide is fully miscible in water all the way up through the nearly pure stuff that is used in rocketry.