Hi Pippo, welcome. I think it does sound like it could be related to dissociation, and it sounds like you already dissociate quite a bit anyway (with the depersonalization and derealization diagnoses.) What does your therapist say about it? I don't think these symptoms should be ignored. When I get triggered and then find that things have suddenly changed in my environment can be because I've tranced out for a while or another alter was triggered out and I wasn't aware.