[GordonS]

> I am certainly, in the clinical sense, addicted - eg if I miss a dose I certainly notice, and there is some degree of tolerance

I believe the correct term is "dependent".

There is a lot of misinformation and stigma out there, so I think it's really important to distinguish between addiction (e.g. insatiable cravings), medical dependence (e.g. someone taking anti-psychotics because they will otherwise have psychotic episodes, or someone taking antidepressants because they otherwise have manic depressive episodes), and physiological dependence, where your body's receptors have up/down-regulated to adjust to a "new normal", and withdrawal symptoms may occur if treatment is stopped.