Mary,
There are at home tests you can now administer to see if you are at the beggining of menopause, but regardless of how the donkey got in the ditch, as my grandma used to say, focus on getting it back out, or in other words the solutions.

Medication is not always the first line of defense. Look at diet, exercise those things that become difficult when we are stressed or anxious. Stay away from fast food and reduce caffeine consumption. START doing the things you used to do that made you happy. Leaving a marriage is stressful so it could be situational depression and not clinical, but either way seek help. My doctor put me on a med that helped with menopause because of a hysterectomy (no ovary's) that is an anti-depressant. But my advice to you is now that you've figured out something is wrong, focus on solutions!
Tunesinger