After six weeks on 10mg with no improvement in depression and anxiety, my doctor increased my dosage to 20 mg. I began to feel an increase in anxiety within a day. Today marks my third week on 20mg and I am still experiencing pretty bad anxiety. Can increasing the dosage of Lexapro cause this increase in anxiety? Is increasing the dosage like starting over and will it take up to 8 weeks to take effect? When should I consider switching to something different? Thanks in advance.