Addendum advice

Hi all! I am 28 and graduated from college in 2020. Last year I tried studying for the LSAT and got a 149, took it again a few months later and got a 150. Starting around 19 (freshman year of college) I began to experience intense fatigue and other strange symptoms. I assumed it was just stress. I did horribly my first semester of college and then was able to sort of manage better. I graduated with a 3.58 GPA. Fast forward to now. For the last almost decade these symptoms never went away but I also was not really taken seriously when I brought them up to my doctors. Finally, a few months ago I had a sleep study done. I was diagnosed with Narcolepsy. This explained so much about the past decade. Falling asleep in class, while studying, while working, etc. Now that I have been on medication my average PT is around 160 and I can actually stay awake while studying. I am hoping to score higher though since I am taking the November exam. Is this something I should write an Addendum for? It isn't an "excuse" but it explains so much of why the past decade has been such a struggle.