I've been where you are now. In a place without hope. I've been so depressed that I felt like I was moving through jello, not through air. One thing that helped at that point was the knowledge that I was suffering from a severe depression, and that it would not last forever. It took therapy medication exercise and time for that awful condition to eventually lift, but it did.
Then I needed to do the maintenance to make sure it was addressed when it started to show itself.
There IS help out there.