I have ADD and was on Ritalin for a while. One way to avoid getting hooked is to take "vacations" from it. I used to use it 5 days a week for work and then not take it on weekends. I eventually stopped because I felt like my emotional responses to things were getting very dull. My wife's comment was that I was treating her like a roommate.

On the other hand, I was very focused and able to keep track of myself much better, and she has questioned me about getting back on it for that reason. So not realy sure which side of me she would rather have.

My advice would be to talk to somebody you trust and see alot, and ask them to watch you carefully and dispassionately and see how you react to it. They can then tell you objectively what changes they are noticing over time, since they may or may not be apparent to you. If you are getting crushing fatigue, then some emotional changes may be worth getting your energy back.