You're symtoms could be the result of a number of factors, however your doctor should attempt to treat indivdual symptoms, as best as he can.
You didn't indicate whether or not you're on any medications for your depression and mood swings.
Congratulations on stopping smoking, but that can cause not only withdrawal symptoms, but anxiety for quite some time.
You may need other things to do with any free time to relieve the anxiety and depression which often results from lack of exercise, poor diet and lack of sleep.
For more information on menopause you might want to check out this website:
I hope you feel better soon.