I deal with the same thing. When it started i thought i was going crazy. Misspelling things when i was handwriting something, typing errors, and when i would speak multiple words for the same thing would come colliding out into some mispronounced mumbo jumbo. The neurologist i saw sent me for a neuropsych evaluation. In the end i was told its anxiety. Now several years later, my mind goes blank and i cant remember what i did last weekend, mothers day, or what that little thingamajig is called. Instead of anxiety its become brain fog. And im not a senior citizen yet!
When the craziness started though i remember becoming very sensitive to bright sunlight, bouts of dizziness, trembling in my hands, and i developed gastro intestinal trouble. Looking back, i think thats when crps really took hold migrating from one region n going more systemically. Hopefully this is not your case.