This.

Look into DBT, specifically mindfulness. A difficult skill to master, but one that can have life changing results.

And although definitely not the first line of treatment, there are also medication options to explore - if you haven't already. I'm medicated to abate agitation and aggression. It helps only up until a certain point, thereafter, you have to learn the skills to deal with anger yourself.

Sorry about the bad news. I hope you feel better soon.