When I went to rehab, for the first week or two I couldn't remember a sentence in the book I was reading once I got to the next one. When on the second weekend I was there, my girlfriend visited me and if something she said reminded me of something I wanted to say, if I waited until she completed what she was saying I couldn't remember what I wanted to tell her. I struggled to express myself because I couldn't string the right words together. It was very frustrating.
I was convinced that I had done permanent damage to my brain - fortunately, that phase only lasted a couple of weeks.