Kinda hard to tell if you are addicted because you haven't given us more detail on the drug and how it effects you and how you feel on and off of it. Sure, part of addiction to most drugs is physical side effects while not using it, but as your doctor said, it could also really just be your nerves.

When you go without your medication, do you crave it? Do you think about it constantly and look forward to the next use? Ask yourself questions such as those and that might give you some answers. If you feel you're addicted, then it may be best to discontinue using it. Talk to your doctor.