I've been on citalopram for approx 7 weeks. And although my anxiety is lessened I'm still having the catastrophic thoughts about illness. I've fixated on bowel cancer now because my mum had it 15 years ago and everywhere I look it's mentioned. I've been put on iron tablets as my iron was low after I requested a blood test for thyroid problems (before I was given cit) so my bowel movements are very dark and can sometimes be loose. I was also diagnosed with IBS about 9years ago. However I am convinced I have BC. I have a pain=ache in my back which I read is a sign, my obvious toilet habits have changed and I can feel.myself starting to panic again. If it was anxiety then surely my citalopram would be working by now. So does that not mean that all these symptoms are the actual thing.