Congratulations on taking the first step to getting better! I can understand your reluctance to take meds, I felt that way long ago. But when you start to feel better, you won't want to go back to feeling out of control. Depression does effect everyone around us, nearly as much as it does us, so think of it also as taking care of your whole family.
As for weight gain, I don't know if it's a side effect of prozac or not. My only experience with it was in college. It was the first drug I was ever prescribed. I think I was too young for it b/c it made me worse almost immediately so I stopped for a week, got better, started it again, got worse, so I knew it wasn't the right one or me. Apparently some drugs, as we know now don't work so well in younger people.
Good luck and we are all here for you.