So if my understanding is correct and often it isn't i am sure you know that

and by all means correct me if i am wrong(awaits correction), initially it will work but eventually it will stop working and it will actually make you worse. I mean you know how important dopamine is copa, you are depleting your dopamine and copa you have to research this boet please. So you have low dopamine and low to severely low serotonin levels right now.
Thus you have no energy, you have no drive, you have no joy, you have no reward system and you are more than likely feeling sluggish and perhaps even extremely tired. As far as i know the drug isn't stimulating either for obvious reasons.
So exercise won't help because you are taking something that is blocking what exercise increases.
Now a drug like welbutrin increases dopamine levels and doesn't mess with your happy juice. Anyways i know right now you don't want to hear the drug you believe is the answer to your problems could be the cause of your problems so i will leave it at that and hope you enlighten me as to where i am going wrong or you realize your problem is popping that drug.
Anyways dude you really should look into anti depressants that increase dopamine and do not block the uptake of happy juice

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Here i found this for you to read and it basically says the same thing, the site i know looks dodgy but the study is spot on, how can the drug you are on work long term when it blocks the the very thing it is made to release

so like i said intially ya wow wonder drug you feel so good, a few months later you are depressed.
http://www.drkaslow.com/html/neurotransmitter_depletion.html