I am on citalopram HB. I can also be a bit funny with tablets...didn't get on well with HRT, and diazepam makes me feel completely spaced out for hours and hours (even the low dose) but I quite like that hahah! But... I have had absolutely no problems with citalopram. I didn't feel a thing - just took the tablet and got on with it. Thought about it for a few days, wondering if I felt different...nope, so just forgot about it. It kicked in properly after about two weeks for me, just woke up one day and felt so much happier in my own skin, much less anxious, (remember how bad I was?) stopped staring glumly into space and started singing again as I was going round the house! I felt sort of calmly excited, and looking forward to things again. Even the thought of reading a new book or watching something interesting on telly got me in a good mood, and I had been so down and miserable before...nothing made me happy, I had lost my joy. ONLY down side was that increased my appetite, but heyho, I feel great. Oh! Also got my libido back as I mentioned in a previous thread, not sure if it was the citalopram or not (not usual for a SSRI) but I am not complaining!
I hope you get on OK with it. It really is amazing when you get the brain chemicals sorted out just how much of a difference it makes to your life.
Edit: forgot to mention I have also been on Prozac in the past, it worked well for me too years ago when I was suffering PTSD after son had horrible accident and I got very depressed. Citalopram is better for anxiety.