I'm in a similar situation as you. I've experienced almost every dissociative symptom there is and have chronic issues with it. Be aware though that dissociation is often a symptom of other disorders too. Since this seems to be your major concern, that's probably not the case, but it might be worth looking into since you have other diagnoses.

I've also noticed that if I focus a lot on my dissociation it can stress me and sometimes make the time loss and feelings of unreality worse. Distractions are often helpful. Also, look into grounding techniques and find some that work for you. This was truly vital for me. Good luck!