Express yourself any way you can! dancing, singing, anything. I suggest dancing and singing because these ways won't leave a hard copy behind, but they are nonetheless really good for your body (and mind) to get that pent up energy moving along.
Maybe put some money aside to get a massage. Or just observe your breathing, make sure you're not holding your breath - imagine with every breath you are getting bigger, and with every exhale you are getting rid of blockages that prevent memories from being shared, and alters from being able to move freely.
As I have DID, I find these things help us relax as a "whole", and can sometimes achieve recalibration and reconnection. Sometimes memories come back, and sometimes alters who have been disconnected from each other will be able to reach each other again.
Just do what you can to relax. You are going through a really rough time right now. You're not incompetent. You are under a lot of stress and your condition's symptoms have been aggravated
You could tell your boss that you have struggled with dissociation and depression in the past, and that it is a chronic condition, so during really stressful or sick times, you might still enter an "acute phase" of symptoms, including (blah, blah... memory loss, sleep/wake cycle disruption... maybe your T could help you think of some terminology).
Maybe you need to take a short leave of work, for just a few days? A note from your T could help. If you are having thoughts of suicide and self harm, and feeling so overwhelmed, it might not be good to force yourself to work where you just get more stressed out