I used to have this exact thing happen - that dread would kick in days before, even when I knew nothing was wrong. I think both answers above are touching on something real, but the pattern part matters more than just the uncertainty itself. Once you've felt that anxiety a few times before appointments, your brain starts treating the *booking* as the threat rather than anything that might actually happen there, and it just loops. The good news is that's actually easier to break than true health anxiety - it's more about your nervous system being stuck in a habit than genuinely believing something's wrong with you. Going through with a couple of appointments where nothing scary happens, and maybe paying attention to that moment when the dread peaks and then... nothing actually occurs, can help reset it.