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!