I actually drink several cups of coffee a day, anywhere from 3-6 and multiple cups of tea too. But because that can theoretically overstimulate my adrenals and wear me out, I have tried drinking no coffee on some days and it doesn't get any better. I do have a general fatigue as well many days though, often leads to weird problems such as being tired in the daytime then becoming more active from 8pm onwards, leading me to start writing papers/doing work often at 11pm-6 am.
I haven't considered taking a stimulant med, I just know that red bull, V, coffee, tea, etc don't make a whole lot of difference.