I don't think you are a burden to your children. You may not be the same mom you used to be, but you are still thier mother. Your children may be growing up and striving for independence, but they will always need you. I lost my father when I was 18 and I don't think I would have made some of the mistakes I did, if he was around to talk to. Depression isn't an incurable illness. It just takes the right treatment that works for you, and people in your life who are supportive and helpful. To me it sounds like you try to take care of everyone's needs before your own and maybe neglect yourself. You deserve some slack and some days to yourself to do things you enjoy and bring you happiness. I know it is hard, when everything you do has little enjoyment, but you won't feel bad forever, and if you work at it things will get better eventually.