I'm wondering the same thing about tolerance. I've been on Adderall for most of the last 6 weeks. I started getting headaches about the third or fourth week and pushed my way through them so that I don't get them any more. I haven't had one since last Friday night. Ironically it seems that the medication stopped working as well about the time the headaches went away.
My problem is I'm not sure what I'm supposed to be looking for. Sure, there's the euphoric feeling which I describe more as "feeling normal" than anything else. I still get that some, but it's not as strong and doesn't last near as long. Afterwards I feel more spacey than anything else. I certainly don't feel like myself, and my level of concentration is definitely diminished.
Why can't ADHD medicine be like Lipitor?
You take it and it works. End of story. With ADHD meds I feel like I'm a drug addict of sorts trying to do what it takes to maintain my feelings of normalcy while my brain and body fight against me.