For fibro fog, I just say I have cognitive memory problems due to an illness I have and then drop it. We really don't have to explain ourselves to anyone.
I have an ostomy so I need to use the bathroom a lot more frequently than most people. But, I don't feel the need to explain why I'm heading to the bathroom for the one millionth time! But if someone is concerned and asks me, then I explain about the ostomy and having Crohn's disease. For you, you could say that you had a stroke so sometimes your brain doesn't "fire" like it should but you are so thankful that you are here and can do all the things you can do. That will stop people in their tracks.
Please don't hate your brain. Look....you are able to converse, be on line, be with your family, etc. Everything you CAN do is because of your wonderful brain! It just had a problem and is getting better now and you get to be with your family and friends and enjoy their company. We all have things happen with our memories....and most of us haven't had a stroke....so I think you are doing magnificently well! Keep on keeping on!
Sherrine