Thanks for all the replies.

I ended up asking my pdoc for extra ritalin for PRN use. I now have Ritalin LA (which is basically 2 doses in 1 pill) and then Ritalin IR (the "3rd" dose). I have to push through this week to get stuff done.

I am taking breaks like everyone suggested, and that seems to help. Unfortunately, I need to still work longer hours (break or no break), which is why I asked my pdoc for extra Ritalin.

So far, the ritalin has been working wonders. The 3rd dose is very helpful. I'm going to try not to use it too often, though. But now that I'm able to concentrate for longer periods when needed, I can afford more breaks.