Time pressure/anxiety with ADHD meds?

I might well be the only person experiencing this, but I have developed this idea after taking my ADHD meds for a while that I can't get anything at all done after they wear off. Which might be true, but I don't ever try and find out, because as soon as I feel them starting to wear off, I give up my task. I know this is a psychological issue more than anything else, but even worse, I've become anxious while working (on the meds) because I am hyper-aware of how much time I have left before they wear off and thus get task paralysis (ex. I become obsessed with "how best should I use this precious time!" and then I do nothing).

Can anyone relate to this?