If anxiety is severe enough to interfere with daily life, then see a mental health professional as you may have a medical or psychological condition requiring treatment.
If the anxiety is not so severe as to constitute a medical or psychological condition, then one needs to develop more trust in God/ Jesus Christ etc. and I would recommend praying more.
“Jesus, I trust in You”.
Or as Padre Pio said, “Pray, hope, and don’t worry.”