There are a number of different definitions of 'addiction'; the DSM for Psychiatry doesn't even have criteria for 'addiction', instead describing 'abuse' and 'dependence'. That said, I think you would qualify as being 'addicted' by most definitions; usually there is a component of 'tolerance', which you describe, and 'psychological dependence', which you also describe.
You have a few options; there is of course the idea of 'rehab', and that should be considered if less intensive approaches fail. The least complicated approach would be to taper down and probably off the medication. Chances are not that you have developed the 'relationship' with the drug, you can no longer use it without it being a big distraction for you-- either because of efforts to get your mind off of it, or guilt and worry over your level of use. It is like a romance with a bad boyfriend, and once you have done the 'love' thing, it is not generally possible to be good friends.
You may want to consider taking a week off to just be miserable; hole up with a good friend, get a bunch of old movies, and stay in bed for a week. The withdrawal is not near as painful as from opiates, but you will be quite depressed for week or two-- that is why it should not be done alone.