Thank you for the support and suggestions. We're working on managing the emotions with exercises from "Coping with trauma related dissociation" and similar self-help ressources, while focusing on keeping the everyday life on tracks. Trying to find the proper balance between "allowing ourselves to feel the feels" and "distracting ourselves from the feels to avoid being overwhelmed".
Another layer is being added to the pile: we are more and more grounded with each passing hour, allowing us to become aware that our worsening dissociation of the last weeks was mirroring our ex-partner's dissociation (and the other way around). Dunno who started it and I don't care we're not here to point fingers. It was a tough period for both of us and shirt hit the fan. Unfortunately I was the one displaying the most symptoms in front of our mutual friends therefore it was logical I was the only one asked to get a grip. Which explains why I was dissociating even more when my ex-partner's triggered parts were the ones asking me to get a grip and stop dissociating for our relationship's sake. It felt like trying to fill in a hole that somebody else kept digging and I did not know why and now I know and it's too late. It's a tough grieving process.
I/we will manage but gosh, it hurts.