More input please so we can try to figure it out with you, .possibly some thing else going on , tell us what it is ,there is a lot of help here.
I don't know whether it is possible to be postpartum after seven years of not - but, it is possible to be be chronically depressed. If you are asking this, it probably is time to see your family doctor. Depression is very real and very treatable. I wish you the best ..