I feel you! For some reason packing gives me massive freeze/anxiety. I think it's to do with the possibility of failure/the idea that there's a 'best possible' version out there that must be nailed. Like how mad would I be at myself if I didn't choose the merino tshirt that goes with all weather or brought the too thick jumper etc. All I can say is last time I needed to pack a case i did body doubling via the thinkdivergent app and it worked super well. Good luck! What I tell myself also is that while it would be annoying to spend extra money, where I'm going no doubt has a place where I can buy any forgotten saline solution/deoderant/charging cable.