You say that you face the sun for 15 min/day. Have you ever dug out the sod or moved the mulch enough to get your bare feet in contact with the actual dirt? We are electrical in so many processes. If this helps, I am willing to take any credit. If it fails or you get worse,chaulk it up as one of the many trials on the path to being as great as you are going to be. Good Luck, Ken in Texas.