If you are mostly in the depressive end, then the meds should be more focused on that. From my experience that is usually how bipolar is handled, they will still want something in place for the hypomania, or mania, which ever one you exhibit.

I have bipolar 1, and when I was on meds, my meds focused mostly on mania and psychosis. I do get depression, but over the years I have learned really good coping skills, and I can pull myself through the depression, with out the use of meds for that.

I hope that helps make some sense out of that. If the meds make you even more depressed, then there is really something wrong with the meds. And that would need to be changed.

Be clear about the weight gain, that tends to make people more depressed, and health wise is not always so good either. Also you should research the medications yourself before you take what has been prescribed. That's true for MI and physical illness. Doctors do not always explain the meds, and side effects well, or drug interactions etc. So best to make sure you know what exactly you are taking. that will also help you make more informed choices about meds, the meds you take is your choice, you have a say in this.