bewildering
Very confusing and overwhelming, making you feel lost.
Bewildering means confusing or puzzling in a way that leaves you completely unsure of what to do or think. When something is bewildering, it doesn't just confuse you a little: it overwhelms you with so much strangeness or complexity that you feel lost or disoriented.
Imagine walking into a huge train station in a foreign country where you don't speak the language, with dozens of platforms and signs you can't read. The crowds, the announcements, the rushing people: everything combines to create a bewildering experience. Or picture opening a math test and finding problems using concepts you've never seen before. That sinking, spinning feeling of not knowing where to begin? That's bewilderment.
When you're bewildered, you feel like you've wandered off the path into unfamiliar territory. A bewildering array of choices at an ice cream shop means so many options that you can't decide. A magician's bewildering tricks leave audiences unable to explain what they just saw.
Bewildering experiences can happen when we encounter too much novelty at once, or when our expectations get completely upended by reality.