I have severe anxiety and recently switched from 40mg Cit to 50mg Sert. I tapered down to 20mg Cit for a week and then switched to 25mg Sert for a week and have been on 50mg Sert for a week now. I didn't have any side effects for two weeks, but today I found it really hard to get up and i'm struggling to do anything today. My anxiety is really high. Is it usual to start getting side effects after two weeks?