How do you cope with psychosis

I’ve had BPD since I was younger, of course they didn’t properly diagnose me with it at that age considering they refuse to diagnose children with this disorder, however when I grew up I was properly diagnosed. Now knowing all people with BPD split and go into a massive rage which before hand enters psychosis. Personally, psychosis is the worst part for me, at first I honestly thought I was schizophrenic. The bug feeling crawling underneath my skin, where if someone or something touched me it on a certain body part it needed to be amputated or beaten to feel normal again. I’d rip my hair out and scream until I literally spat blood and by the end of me breaking everything I would remember none of it by the time I switched. Honestly I need advice on to how to control this psychosis, I understand this disorder can’t be fixed but I know there’s a way to ease psychosis before the rage. I’m desperate, the last time I entered psychosis I nearly killed others and myself.