Aside from the fact that it has already been pointed out that you should never take anybody else's prescription medication, has something changed with your thinking, the way you feel, etc. to lead you to believe that Vyvanse has damaged your brain? Are you having irrational thoughts about brain damage?
Why didn't you think about this before taking it?
I suggest making an appointment with a Neurologist!
This is partially why I'm worried- it wasn't my perscription I was using, I bought them from a friend.
May I ask what it is prescribed for ? I have found a link may give you some answers www.drugs.com/pro/vyvanse.html