What Causes Sudden Confusion?

I had an episode at work where I was unable to recognise my surroundings. I was on my break and decided to leave the building to get hot chips and somehow got lost along the way because I was unable to recognise my surroundings. I have had a CT with and without contrast which came back normal. My bloods also came back unremarkable. I was aware of what was happening to me- that my surroundings were different to how it should have been. It was very frightening. I’m still waiting on an MRI an an EEG to be done. My current diagnosis is ?transglobal amnesia or ?absent seizure. However, I feel that this may be wrong as I was aware of what was happening to me. I was aware that my environment was different. My only explanation is some sort of organic brain disorder. Which is even more frightening. Have you ever come across something like this? Thank you for taking the time to read this. Mel