Hi Sheila... First of all, you're not alone. A number of people here have depression/anxiety/bi-polar/etc conditions. I've read that this is a symptom of PCOS as well. In the past few months I found a depression site to help me through these new medical issues I've found out about and have had to deal with. I recommend this site to you as well in addition to speaking with a counselor.
www.depression-tribe.com
As for your husband, I would try writing down what you feel inside. Write, leave it for a few days, come back and read it, edit, leave it, edit, and so on. Then in about a week or two you have a good letter written out for him that you can either give to him or read to him so that he can see what you are feeling inside and so that he can see it isn't him and that it is you, but that you are working through it. Be sure to list out things you would like him to help you with to get you back on track with happiness. Don't expect to go through this alone.
I'm on that other site I mentioned with the same screen name so feel free to contact me in either place if you would like.
Good luck!