Actually, I've discussed this issue several times. Depression can give you increased or decreased appatite. If it was decreased, any successful treatment of depression could lead to improved appetite, returning to normal, and thuis to some weight gain. Depression itself can cause weight gain or loss. Then specific antidepressants, like Aropax, can in some people additionally encourage a degree of weight gain.
While you still need the Aropax ( check with your shrink / doctor before stopping it ) ; cope with the weight gain by improving your diet and by increasing exercise, in the sound old-fashioned way. A sudden or early stop to the drug could lead to the return of the Depression.