I was given Mirtazapine 15mg for anxiety three weeks ago but it made me feel worse and suicidal so gp changed me to fluoxitine 20mg three days ago along with some diazepam 2 mg to take the edge off short term... My anxiety is horrendous first thing in the morning and it's like a physical pain int stomach. This goes on for hours and I start to relax early evening but am always worried going to bed because know I will wake up with that awful anxiety feeling again. Feel desperate. How long did others find fluoxitine took to start to lessen the anxiety pains?