M.G.
I know how you feel, I am the same age, married for almost ten years, and the last few months I feel like I've beed on the verge of rage at all times. It is stress, for me. I need to take some time off -- I have a weekend away scheduled this month.
I want to note that the med the doc put you on is typically not healthy for anything. It is like taking a shot of liquor throughout the day, and eventually, you will need more and more of it to gain any benifits. It upsets me when doctors prescribe it, because it only treats a symptom, not a cause.
I hope that you find something truly helpful -- Good luck!