firstly, modern anti depressents are in no way addictive. Far too many people still believe that you have to 'pull yourself together' - which is okay if you are a pair of curtains.Otherwise it is *rap.
there is no shame in depression and your doctor will be understanding. you have to have faith in her/him. You have to believe it is an illness [an imbalance of the chemicals in the brain]that is curable. after that you can look at your relationship - one thing at a time. make that appointment and take your friend along for support. don't leave it any longer,
take care,
love from
tess