A serious mold issue no one ever talks about is the mold exposure you all have daily from your shower head. My mother was suffering from many of the symptoms all of you have listed here. Her doctor asked me to remove her shower head and swab the back with a q-tip. I did. It was black and filled with mold. I ask you all to do the same. This is possibly one of the largest potential cover-ups you have seen. The manufacturers know. Showerheads never dry out and the cheaper they are, the more plastic the inside, the more porous the material, the more the mold and other harmful bacteria. You cannot see it You cannot clean it. Steamy showers cause you to breathe it in. All very dangerous. If anyone is interested, I fixed the problem. Feel free to contact me. Not a sales pitch.