Lisa--
I have been there, my friend. Depression is a terrible animal. And while lighting candles, listening to happy music, more light etc may work for some, if you're truly depressed who the hell takes the effort to do those things??
If you can do those things and they help then by all means do them.
The jealous thing...I get that too - and I get really bad anger problems - that on top of depression.
Does this happen every year? How do you get through it other years?
A talk with your doctor may not be a bad idea...
Please continue to talk to us - and vent as needed.