Can somebody ist me with menopause and weight gain.?

I am hoping somebody can offer me some kind of advice in relation to menopause & weight gain. I am 45yo and have gone through, what my doctors say, early onset menopause. I have not changed any factors in relation to my diet that have caused me to gain the excessive weight that I have. In fact, I have always been an extremely small eater for most of my life and continue to be the same. Although, I do not do any form of exercise I am constantly on the go I do not sit down until about 10pm. Does anyone know of a good treatment that can ist me with weight loss. This is getting me more depressed and anxious than the actual menopause. The mood swings alone that come with menopause are bad enough but now I have a self confidence problem due to the weight gain. I do not mind if the treatment is a prescribed treatment by a medical practitioner, as I will see my doctor and request it. Please, if anybody can help me, before I go stark raving mad, it would be very much appreciated.