Hi Sazza- I just clicked on this because citalopram had been new to me, wished to see what others were saying about it. Insomnia? Whoa. I'm sorry it didn't work for you, but it does sound as if you do require something to adjust your chemistry, hate to hear you're having such a tough time.
Since you have an appointment booked for Friday, have you tried typing in various meds to the search option here, to see them discussed? They're all here somewhere, to be sure. I'm sure you know this, the only reason I'm offering this as an option at the moment is because you sound so terribly shredded- sometimes just being able to have some positive occupation which contributes to your healing can be enough of a diversion to be helpfull in getting yourself some peace, you know? Docs tend to like the input also, at least the good ones do, but you probably already know that.
Friday is only a few days away, almost there! Do take care.