Ibs + Citalopram - advice needed

[Alli2oo5]

I've had bad ibs-d which only just died down in the past year or so with the odd once a fortnight flare up (instead of all day every day). Because it got better I stopped taking Citalopram in December as I felt fine anxiety and ibs wise. But this week I've had a sore stomach with d every day so far.
It could be down to stress as I'm planning my wedding for September. But I'm no more stressed this week than any of the past few weeks. I also take probiotics and thought they played a major part in me feeling better.
Calling for a docs appointment tomorrow anyway as I can't go on feeling like this in work its making me feel down and I feel sick about the possibility of this being my life again.
Has anyone had similar issues and found anything that helped? I also came off Citalopram as thought it was what was killing my sex drive but it's not returned so guessing it's my contraceptive pill causing that. So wondering if I'm best to just give in and go back on Citalopram.