Does anyone else sometimes get confused or shocked at "learning" you have a dissociative disorder?

I know I've had the diagnosis for several years now, but I still sometimes go through a period of "forgetting" I have it. Most recently, I was thrown off in session on Monday when t referenced if. For some reason I thought it was something just I believed, not something she agreed with. I thought it was a self-diagnosis, though I couldn't tell you why I thought that in the moment; I didn't think it had basis in reality.

Similar stuff has happened a few times over the years. Once I called t in a panic asking if she also thought I fit the diagnosis for what was at the time ddnos (current t at the time had brought it up). She was really good about it and explained that she agreed I did, why she agreed, then asked if I remembered talking about it with her in the past. I didn't... another time I was talking to a pdoc about history, and he mentioned seeing dissociative disorder in my records. I was shocked and confused. I told him I knew I was forgetful at times, but didn't think I fit a dissociative diagnosis. He kinda just nodded and moved on. Apparently we had tasked about it several weeks prior.

So... is it normal to freak out about this diagnosis over and over again? I feel like it keeps happening, but I should know it by now.