possible trigger

ive self harmed since i was about 14, but up till age 18 it was only little scratches. since my first 'episode' it has got a lot worse. ive had to have stitches on 4 separate occasions and narrowly missed needed surgery. both my arms are fully covered in scars.
my question is, is this usual for schizophrenia/psychosis?
my pdoc said it depends on the reasons for doing it and my reason is that i use it to ground myself when things dont feel real and the thoughts are getting too much.

does anyone else with psychosis/schizophrenia have experience of extensive sh?