Hi Maggiee19,
First of all, great job posting this. It takes A LOT of courage to put yourself out there, so well done. I have found that my mood has very little to do with my quality of writing. I've looked back on work from days I was super-inspired and think,
eh, and from days when I REALLY did not want to write, didn't feel like it, etc., and found some of my best work. So, mood, for me at least, doesn't determine quality.
That being said, there is a difference between sadness/lethargy/weather and actual depression. I'm not a doctor, but as I understand it, depression is an actual illness, a medical condition that is perhaps genetic, etc. It's a chemical thing where someone isn't getting the balanced amount of certain chemicals in their brain, and this can be mitigated by exercise, humor, friends, etc., but not entirely lifted without medication. Antidepressants can DEFINITELY help a person. To someone with Depression, they're like insulin to someone with diabetes. Depression isn't a 'weakness of character' or anything like that, just as diabetes or chronic fatigue syndrome are not. My opinion is that anyone struggling with depression that lasts more than a week or two would be greatly helped by talking to a doctor/psychiatrist...because if a pill made to fill in those chemical gaps in a person with depression's mind lifts depression and allows someone to live normally, that's a miracle. And it's available to people suffering, right now.
I think someone trying to fight actual Depression (the medical condition) without professional help/medication is like always trying to swim through life with weights on their feet. I wish you good luck. And if you need some inspiration, just google 'famous authors who had depression.' You may be surprised!
Best of luck!