Citalopram

I've started taking citalopram recently and I've been signed off work so far for 4 weeks.. I'm due to go back to the doctors on Friday to see if they feel like I should be signed off for another 2 weeks.. I feel like I'm so alone in all this, cuz the friends I do have I work with them and I feel like they think I'm taking the piss but I dont know if that's just my head... does citalopram make anyone else feel crappy before they start to feel better?