We have to fight them daily, like fleas, those many small worries about the morrow, for they sap our energies. — Etty Hillesum. Dutch Jewish diarist (1914–1943) Relaxation
I do believe it is possible to create, even without ever writing a word or painting a picture, by simply molding one's inner life. And that too is a deed.
One must also accept that one has 'uncreative' moments. The more honestly one can accept that, the quicker these moments will pass.