I'm happy to hear that you have gotten much relief.
Prior to using the "cage" did you try a grounding or earthing mat, sheet, pillow or similar during sleep?
Have you tried a computer technician's grounding wrist strap while sitting at the computer, watching a movie, etc?
Do you have any clues regarding the underlying cause(s) of the EMF sensitivity? For example, have you investigated the possible involvement of heavy metal toxicity?
I did not have EMF sensitivity but I did notice that I used to be so vulnerable to static electricity in the Winter before my years of HM detox. I used to have to touch something before kissing my lady friend or we might exchange more than one type of "electricity" : )