I relate to all of the above. It is so embarrassing when I can't remember my words, when I am talking. I excuse myself by saying, "Sorry, sometimes I lose my words." I sometimes call one thing by another name, or even say, I know the word but starts with a "B"????, or whatever letter I understand the word to begin.
I do believe that the meds and general brain fog from RSD cause the ML. The tiredness is from being in chronic pain 24/7, insomnia, depression,anxiety, and other disorders. There are many reasons for being tired...we must keep our chins up, and "own" what we all share in common. It doesn't make us weak;in contrast, it makes us stronger.
Dew