I can’t pretend to give any kind of professional advice, but when I get blue it is sometimes around usual times and events and I’ve learned to at least pull myself away enough to think, “OK, you’ve done this downward spiral before, you have this tendency, don’t let it get bad, just manage it and get through”.
If it was day after day and as debilitating as the OP describes, I would seek out medication and professional help.
Ask you PCP for help and ask for ways you can get help without having to get on the ferris wheel of an initial expensive consult visit with someone you may not even mesh with.