St John's Wort interferes with estrogen. Check with your doctor

You don't get 'hooked' on antidepressants. They correct an imbalance in brain chemicals. If they work, you feel better (not a LOT better though, if you get my drift). If they don't work, you may not have an imbalance. I took Welbutrin for a bit and it did absolutely nothing for me other than gradually eliminate my ability to sleep. If meds work, they work, but you don't get addicted to them.

Talk to a doctor. It may be a chemical thing, or a psychiatrist or counselor may be able to give you ideas for tools you can use to get yourself out of the dark.