I tried using the Earthing Mat, but it made my electrohypersensitivy (EHS) worse. I think it actually turns the body into an "antenna" and the body ends up pulling in the Electromagnetic Radiation (EMR) from the neighbors Wi-Fi and EMF from the wiring in the walls. I moved my bed to the middle of the room 2 feet away from all the walls.
I tried to use the Earthing Mat and within 2-3 days I noticed my EHS symptoms got much worse. I thought earthing was supposed to help, but I think it attracts EMR to your body eventually causing it to be overloaded from the radiation. Also the ground plug also has the potential of bringing any voltage in the ground up into the earthing mat. Look up "dirty electricity" and Dr. Sam Milham explains in his videos how electric companies use the ground to return the electricity back to the electric power station instead of using a return wire.