If you aren't on any other medication, I - as a person trained in phytotherapy (herbal medicine) - recommend that you get on TINCTURES of Saint John's Wort and Passiflora. I, personally, recommend the Bioforce brand, which you can pick up at any good independant health food shop (don't bother looking at some place like Holland & Barrett). They are strong and effective, but without the nasty side effects of the prescription anti-depressants out there. Those blasted things have horrendous side effects that are more depressing than the depression in the first place. And, the Saint John's Wort and the Passiflora Complex are non-addictive and non-habit forming, so you could just take them during the winter when you are prone to the attacks. They are also relatively inexpensive. A month's supply of both of these tinctures will cost you around £16.
You asked. This is my best advice. I wish you well, and I wish you health.
~A