Some of it might be partially posture based due to using smaller devices.
Hunching shoulders, tilting head downward for extended times, locking elbows in to body Those postures can close down the area where a lot of our veins, arteries & nerves travel.

It's hard to set up a tablet or phone be very ergonomic.
But stretches & doing reverse postures at times can help offset the negatives.

You might check for head forward, shoulders forward postures and see if working on that makes a difference for you..

But there is EMFs to consider also.. EMF stands for electromagnetic field.
EMF Health Effects - Electromagnetic Field (EMF) Safety from Safe Space Protection

EMF - Google Search

Thanks for the responses, obviously just me who experiences this.

I think it's definitely related to electromagnetism because I will get tingling in my fingers as soon as I touch the screen/ pad. I can even feel a buzzing sensation through the charging cable if it's plugged in. Also, I usually don't spend much time on computers because I work outdoors so I don't think ergonomics are an issue.

Fairly sure there's no cure anyway so might have to go back to an old style "dumb" phone and a mouse!

I don't get symptoms from devices, but sometimes when I put my hands under the faucet, the first place the water touches receives a sensation like a big electric shock. My hands are pretty much the only place I don't have SFN symptoms otherwise! It's all very strange. I've heard the saying that everyone's lupus is unique, and the same thing seems to apply to SFN.

Thanks Dogwalker, I might try some thin knitted gloves.

I've also had shocks off water taps but this turned out to be a faulty earth in the house I was living in. Apparently it can be quite dangerous, even fatalaties have been recorded. A building electric system is often earthed through the old copper plumbing pipes but in dry conditions, or if there's a loose earth connection, then it is possible to receive a shock through the taps. Might be worth checking out!