I have been on celexa 10 mg. for a year, but don't notice a big difference in my anxiety problem. I was prescribed Ritalin for MS fatigue and possible ADD, and I keep getting anxiety attacks about taking my Ritalin sometimes. I saw my doc today and she increased my celexa to 20 mg. I'm hoping this will ease my anxieties so that I can continue to find a therapeutic dose of the Ritalin and not be anxious about taking it. just a note: I have struggled with anxiety, worry, depression for over 20 years. it has caused my life to come to a slamming halt. I want to be happy and productive again.