sunny, that sounds so intense and very very difficult.

Yes I can imagine after something so overwhelming as having to share such personal things with someone new would be so exhausting.

Time for yourself sounds like just what you would like and it's okay to do just what you like. That makes perfect sense and sound very self-caring and self-comforting.

Why not keep the appointment for now, knowing how feelings change; you can always cancel closer to the appointment time if you wish to.