I would also recommend at least a second opinion before taking any medications.
Also, I wonder how much unexpressed anger you may have that you are burying. I have come to learn how depression works from the mind/body perspective. I was diagnosed with severe clinical depression many years ago. None of the medications helped at all and some of them ended up being life threatening. I began to study about how our thoughts and unconcious belief systems effect us physically. I now know, because I no longer suffer from depression, that there are alternative ways to deal with what our bodies are reacting to.
There is a direct link between supressed anger and depression. I learned as a child to be a "good girl", to not express anger, to suck it up, to be nice, etc. When I had children and was in therapy I began to understand how not having permission to express my anger appropriately had undermined everything in my life. I then learned to express my anger, not only at current situations, but also, the deep resevior of anger I had stored up.
I also began to dissect the "good girl" belief systems and learn what healthy boundaries were, learned to say "no", and really leaned into self-care. I put myself first on the list and started to give myself all the care I hadn't received from my parents or my spouse.
I no longer suffer from depression. My body is healthier and stronger than it has ever been. I am enjoying my life like I never even thought was possible.
I'm not saying to not look at physical symptoms. I am suggesting that along with medical attention, there is likely an emotional, psychological, cognitive, element that will utimately shift things for good. Even all the studies on anti-depressants admit that they are only helpful in the short-term. Therapy and other modalities of thought and behavior shifts have been proven to cure depression and other physical ailments.
There are many doctors now that are realizing how the mind effects the body. I highly recommend that you do some research. Deepak Chopra has done a wonderful article about this that I just read a few weeks ago on the Oprah website.