They sure do go hand in hand. I think either forum is fine to post about it probably. Maybe determine which affected you more, the PTSD or the DID. If you are more affected by the fact that there was a trigger and the PTSD it caused, I would say then post in the PTSD forum. If your concern is not so much that but more about the struggles with switching and missing time or things that happened because of it, maybe here. That's just my opinion though. I struggle to post overall so someone else might have better advice in that area. Personally, I think it'd be fine either way.
It's hard when I am checked out and then get asked questions about something. I do a lot of tap dancing sometimes. I think people often think I am an idiot sometimes though because my answer in no way answers their question lol

, but we can only do what we can do, right? Just try to keep in your head that you are doing the best you can. It took a lot for me to even consider that statement but when I do remember it, it helps.
Take good care.