Adult AD/HD and medications. What does anyone know about it? I'm scared it's going to mellow me out to much.

I'm a sagittarius with a yellow life aura (yes I like new age stuff and it fits me like a glove :P) I really love the fact that I have a very get up and go attitude and bottles of endless energy, but since being diagnosed I have begun to notice that I am easily distracted and get really annoyed when I can't get back on task. Before being diagnosed I never though of it, if I got distracted I just went off with whatever I was doing. I've realized if I drink a lot of caffeine I actually tend to slow down which makes sense with the diagnosis. I often quit soda for periods and have even more energy but I always have a soda when I go to class or am working at a job that I have to sit still for the whole time. My therapist has suggested talking to my doctor and going over my options for drugs, but he's so RX happy I don't want to talk to him until I know what I want. I'm afraid if I'm on the medication I'm going to be lethargic and not have my endless energy and I enjoy it so much!