daniels
The method is to hold a medium sized rock in your hand while using the device, or afterwards after the appearance of symptoms.
The only thing which could be happening is your skin absorbing what's on the rock's surface, there's no grounding involved.
My speculation is that those of us who have this problem do not have sufficient connection with the earth. There are negative energies that are emitted by these devices which we do not sufficiently understand, and which are probably not sufficiently measurable with the means currently available to us.
I'm sorry to burst your bubble, but grounding is heavily deconstructed in the engineering industry and it's not something "we don't sufficiently understand"
There are no "energies" (as in, chakra / voodoo stuff that's pushed by people that preach "grounding" on social media) being "flushed out"
I will however say that electrical grounding of your electronics (especially for headphones, keyboard, mice, since they're in direct contact with our bodies) is a good thing and bad grounding can cause a myriad of issues for PC's (and electronics as a whole), along with potential health concerns. (emitted electric fields, RF emission,...)
In fact, bad grounding could potentially affect monitor timings and monitor voltages (perhaps even oscillating the backlight in extreme cases? I personally haven't seen this documented, but think of brownouts in a sense)
Ever felt tingling from a aluminium keyboard during PC use? That's bad grounding.
It means the device emits a electrical field (measured in V/m) which is in very unsafe ranges.
(note: Do not use devices such as the Trifeld, Safe&Sound Pro & similar ones to measure this, they're insufficient and somewhat of a scam compared to real solutions made by Rohde & Schwarz, Telcroy, Keysight,...)
I do however believe that walking with non-insulating shoes on grass (leather-bottom shoes for example, as I find walking bare foot grotesque) or walking on sand (bare foot or with aforementioned shoes) are a good health practice and should be practiced by everybody a few times a week.