I've been on fluoxetine 20mg for 17 days now after a three month break since coming off citalopram. I suffered with horrendous discontinuation and so am trying flu. I noticed initial improvement quite quickly, day 5-6 my morning anxiety had gone but then........two nights ago I woke feeling really weird, pouring with sweat, diarrhoea, feeling really sick, very anxious. Awful. So disheartened after the initial improvement. But I guess after 2 weeks levels are building up. I freaked out and thinking it was seretonin syndrome. Does this sound normal for the timeframe. Part of my discontinuation was major derealisation and depersonalisation due to major anxiety and severe depression, so I'm hoping fluoxetine will help.