The Brit was working on a drama and a comedy, but the films failed to make it to the big screen because of financial issues.
The setbacks hit Davies hard and he debated giving up his moviemaking career - until his 2008 documentary Of Time and the City became a critical success.
He tells Britain's Telegraph magazine, "The struggle to find money is the most eroding thing, particularly when you're told that everyone likes your films but nobody will put money into them.
"I'd got to the point where I just thought, it's too difficult. I can't do it any more. I'm sick of the struggle. I really felt defeated. And that's when it has its worst effect on you because you think, well perhaps I've got no talent; perhaps what I'm doing, nobody wants. And that's the worst thing of all."
Davies' new movie, The Deep Blue Sea, starring Rachel Weisz, is his first feature film since 2000's The House of Mirth.