Short-term Memory Loss

So, I have suffered from short term memory loss for about, I would say, four years now.  I believe it is completely related to when I began having seizures, especially since I went without knowing what was going on for like 2 years and was not treated.  I have issues in school because I cannot retain information, even things as simple as historical dates or the names of my classmates.  I went to have a memory evaluation so I could maybe get some help in regards to exams, but the shrink just said "you have ADD/ADHD, that's why you have some short term memory problems" and he completely belittled me and basically called me a liar.  Now, this does not make sense to me because I've known that I have ADD for years; it was very obvious when I was young.  I've never taken medication because my parents didn't want me to have that giant label on my forehead for my entire life.  I did fine with tests aside from a little anxiety in high school and before; this memory problem is new.  Has anyone else experienced this?  What do you do about it?  I have lost half of my senior year of high school because I started having seizures sometime after I graduated.  What do you all think?