Whatever you do, please do not stop taking these very important vitamins. Read up on how vitamin B's affect our energy and mood.
Read up on hypoglycemia - you'll be surprised at how much information you will glean from knowing how closely related Depression and hypoglycemia are. do a search on "jurplesman" in Curezone, and take a look at some of his links. Amazing information.
You are very smart to have looked for solutions rather than getting on the antidepressant wagon.
Love yourself, smile, love your child and draw energy from the love that emanates form just hugging.