I have similar problems as well. Mine are caused by severe hypothyroidism that hasn't been treated correctly for more than two decades now.
In my case, I have severe memory problems. If I want to remember something, I have to write it down and leave it on sticky notes all over the place where I'll see it. A lot of times even if I see it, I still don't remember it.
I leave the medications I take sitting out where I'll find them in the same place every day and I have an app on my phone that reminds me to take my medications, yet half the time I still forget to take them.
I also struggle when having conversations, even on the phone. It takes all my strength and energy to focus on what the other person is saying and to follow the conversation.
I'm constantly being yelled at by people because I was supposed to text them or call them and I didn't. I would think that I did, but it would turn out that I didn't. Most things I watch on TV, I have to watch in a way so that I can run the same scene over and over because I miss parts of it if I only watch it one time. Therefore, it makes it hard for me to watch a TV show or a movie with other people because either I get completely lost as to what's happening, or they get annoyed that I have to keep running it back so that I can follow what's going on.
I know that most of my issues are caused by the thyroid problem, and some of it is probably either caused by or exacerbated by my depression; but I also worry that I might actually be in the very beginnings of some kind of dementia disorder. That thought scares the hell out of me that someday I might not know where I am and I might not be able to take care of myself. I would rather be dead than be at the mercy of other people. That's one of the reasons I plan to ctb soon. No matter what I have exactly, I can tell that it's only getting worse as time is going on. And all the doctors do is the same old thing that they did before that didn't work. They seem to have no clue how to fix it.