What is going on with me? Have I entirely lost the plot?

I showed up to my appointment a week early and was confused because I swore it was this Wednesday. It's actually next Wednesday. I felt embarrassed and rather stupid. The cherry on top was walking to an identical car and actually sitting in it wondering why all these extra objects were inside my car. It dawned on me this was someone else's car and spotted my own in front of another building further down in the business complex. I locked the door to the other car and made a move to my own. I can't believe I've become so stupid and lost. I'm having a hard time remembering appointment dates and times. I'm having issues remembering where I parked my car. I've been feeling lost.