I wouldn't waste money on any mystery herbs. They're either useless or potentially harmful.
You might be able to manage without the meds through regular exercise (think twice a day). Also, the supplement omega-3 fatty acids really have been proven to improve brain function.
Also, try caffeine. Ordinary caffeine. Just make sure your source allows you to measure the dosage precisely. (Coffee is an imprecise source, unless you make it yourself the same way each time) If your heart is thumping or you can't sleep, it's too much.