Your mentioning your painful feet reminds me of something from my past. WAYYYY before I learned about Iodine is when I learned of the importance of good hydration.
I got Dr. F. Batmanghelidj's book "Your Body's Many Cries for Water" and by ensuring I drink half my weight in ounces daily, and taking 1/4 tsp of my RealSalt for every quart of water I consume, the pain in my feet went away.