Dyazide and important things

For about 6 months I experienced severe cognitive disturbances. I had trouble remembering things, and making basic connections. I also had chronic fatigue, and terrible headaches, severe depression, moodiness, trouble sleeping, and trouble making sentences. I was so out of it that I couldn't make the connection with the medicine. I was 16 at the time, and my doctor thought it was just normal teen issues or something equally absurd My eyesight became worse, and my usual ability to retain information in school was butchered. Once I got off it, I felt much better. I could think again, and no was no longer forgetting important things, like my best friends name. However, it has been a half year since I got off, and some of the symptoms still persist, although in a much less degree. I am afraid of permanent damage, especially with my cognitive ability.