Question: Hi Dr!
  I'm currently 20 years old, 2nd year in my college, and also undiagnosed. I "was" high performing especially in my elementary years until about 8th grade (almost always at the top of my class). From then on out I started to underperform and noticed something might be wrong for me.
  Recently, I was in a horrible state and I wasn't even able to attend my (online) classes since I'm starting to hate school and doing any sort of school work. I also found out some symptoms of having ADHD in Reddit, and since then, I suspected myself of having one.
  I'm still not sure (someone also pointed out) since 'overstimulation' also produce the same symptoms. That is also my question. What is different about being overstimulated and actually having ADHD?
Answer: There is no evidence that overstimulation cause ADHD although if ADHD symptoms only occur when overstimulated, that typically would not be diagnosed as  ADHD because the disorder always occurs in more than one type of situation.   It is best not to wrestle with what you think does or does not cause symptoms of ADHD.  It is better to describe your situation to a psychiatrist and have them decide what, if any, diagnoses may explain your symptoms.
content: Q: Hi Dr!
  I'm currently 20 years old, 2nd year in my college, and also undiagnosed. I "was" high performing especially in my elementary years until about 8th grade (almost always at the top of my class). From then on out I started to underperform and noticed something might be wrong for me.
  Recently, I was in a horrible state and I wasn't even able to attend my (online) classes since I'm starting to hate school and doing any sort of school work. I also found out some symptoms of having ADHD in Reddit, and since then, I suspected myself of having one.
  I'm still not sure (someone also pointed out) since 'overstimulation' also produce the same symptoms. That is also my question. What is different about being overstimulated and actually having ADHD?
   Ans: There is no evidence that overstimulation cause ADHD although if ADHD symptoms only occur when overstimulated, that typically would not be diagnosed as  ADHD because the disorder always occurs in more than one type of situation.   It is best not to wrestle with what you think does or does not cause symptoms of ADHD.  It is better to describe your situation to a psychiatrist and have them decide what, if any, diagnoses may explain your symptoms.