My first dose was 4/19/2021. My second dose was 5/21/2021. Within an hour of my first dose, I started to develop a very intense and severe headache in my forehead that lasted for days. This was probably the worst headache I've ever had, incredibly distracting, very painful, was hard to get any work done or do anything while it lasted. It lasted for days and slowly subsided over several weeks. About 1-2 weeks after my first dose, I started to notice some cognitive changes in myself. I wasn't understanding a simple joke a friend said, when normally her humor is very easy and I have never had issues with her jokes in the past. Another friend I confused dates of plans, when normally I am very organized with my calendar and timing, but suddenly I was having a hard time keeping track of days of the week and dates. She noticed it as well. Over the next few weeks and months, it got worse. Suddenly I wasn't able to retain information I had just heard - for instance I was in class and a teacher would tell me something. I would hear her, understand what she said, repeat it to myself, and promptly forget a minute later. One occasion, I asked a question and the teacher reminded me she had just said that information (yet somehow I couldn't remember it). This has happened multiple times with my boyfriend as well - I ask him something, he responds, I forget his response immediately and I forget I even asked, so I ask my question again. He reminds me I just asked, at which point then I remember I asked, but I forget his reply. He has commented multiple times on my memory issues. My mother has also noted my memory issues and has commented on them. I forget conversations we have - for instance I was supposed to teach her how to tint her eyebrows. The conversation happened, and yet I totally forgot it happened. I asked her a week later if she wanted me to teach her how to tint her brows and she paused and then reminded me that I already had. This is extremely unlike me. I am known in my family and friends for having an excellent memory. My earliest memories date back to when I was 17 months old, and yet suddenly I had this awful headache after my first vaccine dose and now I have trouble remembering something I heard 3 minutes prior. I can't retain information. This has affected my work, my earning ability (I had the worst quarter I've ever had this last quarter), my schooling (I forget what I learn). I have also messed up the order of words and numbers. For instance, I will invert an idiom unintentionally, so instead of writing "stone cold," I'll write "cold stone" and not realize it until later when I re-read an email I sent. I will sometimes add verb endings to nouns by accident - for instance if I am trying to say I was reading a book, I might say "read a booking." I won't notice until later when I re-read what I wrote. This is a problem because these emails are going out to clients! I have also inverted numbers in sales quotes, a huge problem considering that I work in sales and what I quote and sell is my livelihood. Luckily I have caught myself most times, but there have been times I have inverted something that was supposed to be in the tens into the hundreds place and vice versa and that impacts my quotes! I reported all of this to my doctor in August, they had a virtual appointment with me in September, and then referred me to the cognitive neurology department. I have recently gone through cognitive testing, and I am waiting for the results in two weeks.