What are the best natural remedies for depression?

I have been suffering with depression for about 7 years, i finally got put on some medication, i am only 20 years old ..but i have lost my insurance and cant afford my antidepressants .. I would like to find a natural way to reduce my depression symptoms. I take digoxin (for my heart problems (sinus tachrycardia) ) and i take meds for my low thyroid and birth control) So i cant take any herbs that will interfere with these meds.. Any suggestions? I take a multivitamin, biotin, vitamin c, and a couple other vitamins (not everyday) .. I have read about St. John’s wort? can u buy that at any vitamin store? i also heard it can not be good combined with my digoxin or have side effects to my birth control.. so what u think?