I’m sorry your having this happen. I know it feels terrible.
As far as why you or why any of us? It’s just one of the symptoms. It’s glitches in the brain wiring. It’s not a judgement on wrong doing any more then any other of our symptoms.
I also get tactile hallucinations. Some are very upsetting but I find if I just get up and maybe do something else, a bath or a walk around the apartment then they tend to go away.
When I used to lay still and feel those and get upset, the stronger and more horrid they became.
When my doc said, "You just have to get up and divert the sensory just like with the voices, and do not get down on yourself about it… " then I was able to cope with it better.
I hope you feel better soon and this stops for you.