I recently started 10mg of Celexa for anxiety and depression. I have been taking it for almost two weeks and it seems I'm feeling worse. I'm exhausted all the time and I feel mentally foggy every day, like I can't concentrate. Also, I am feeling more anxious and emotional than normal. Do these side effects go away? How long does it take Celexa to work? My doctor wants me to stay on the 10 mg dose for 4 weeks before increasing.