Still Lethargic

Your doctor wanted you to stick with the medication but you stopped. I don't know if that was a good idea or not but perhaps your doctor will prescribe medication that won't leave you in a sleepy state.

I think I'd call your pharmacist and see what they say. A lot of the time they have more experience with prescription medications than the doctors that prescribe them, so they can tell you if the side effect is typical or not. My reaction to Gabapentin was pretty much exactly the opposite. It hyped me up within a few hours of taking the first pill, but the effect lessened within about a week or so. It made me feel foggy as heck, too... I'm not really sure how to describe it, but it kind of felt like the left half of my brain went numb. I had to stop taking it after about a month because of major adverse side effects. Hope you start feeling normal soon. If I recall correctly, it took about a week for me to stop feeling the effects of it after I quit taking it.