Can't understand English

Not sure what to think. It has happened before, but not quite so obvious. I always thought there was something wrong with my hearing in the past.  Today, I had a client tell me her daughter's name and spell it for me. I sat there with a stumped look on my face as it seems like she was speaking a foreign language. My brain could not comprehend what she was saying.  I have no idea what she thought of me then.  WOW!  I managed to get thru the interview with her somehow...
I had episodes like that before. I always thought it was something to do with my hearing.  I felt like there was a momentary disconnect between my brain and my hand for writing it down or comprehending. These moments were quick and I never gave them much thought. Today, I was just stuck. I couldn't understand her at all and she spoke clearly enough...it was me.