Ruminating over possible conversations and dissociate.

Don't know if anyone else experiences this, but I've been having it a lot the past week. 

Sometimes when my mind wanders it starts to daydream/ruminate on possible conversations I can have with people, particularly those close in my life. It may be in relation to something that's already happened and the conversation is like me trying to predict what my next interaction could be with them. I always get so caught up in it that it's like I dissociate from the real world and I'm having emotional reactions to the conversation in my head. Usually frustration and agitation.

It's really upsetting as I waste emotional energy on this and chances are the conversation will never happen in the real world. I just get lost in fantasy when I just want to feel real and in the world.

I don't know if I've explained this right but does anyone else get this?