I don't understand how you can get actual nerve damage from rubber dome keyboards. I was on them for over a decade straight and suffered no ill effects.
I have known ppl who drove thru stop signs for over a decade and suffered no ill effects according to them. I would invite him on here to tell you about it except he's dead. Auto accident.
I have known ppl who drank alcohol heavily for over a decade and suffered no ill effects according to them. I would invite him on here to tell you about it except he's dead. Liver failure.
I have known ppl who smoked for over a decade and suffered no ill effects according to them. We all know they are lying.
The only thing that I can think of is poor typing technique.
Did you type millions of keystrokes per year?
I typed continuously all day every day. 20 hours a day for 3 years.
The damn rubber domes were very stiff too. I was used to cherry black and other springloaded switches. I got tricked into using that damn rubberdome over membrane keyboard.

Age has something to do with it too. The younger you are the easier it is for your body to handle damage and irritation.
I know I had bad luck and all. When u bang ur nerves around u r rolling the dice.
A typical person would just get Tendonitis or Carpal Tunnel Syndrome.
I have met a gazillion young seemingly healthy ppl who have Carpal Tunnel Syndrome. They got it from a wide variety of causes but the point is that is actually sort of easy to wreck your hands. Especially if you are a workaholic like me.
I rolled the dice. I lost. I advise others not to roll the dice.