Hi Vanessa
Sorry I can't be of help with the HRT or Citalopram but I was prescribed Mirtazapine 30mg back in May for anxiety and mild depression, I found they more or less worked overnight by lifting my mood, however after a week or so I found my anxiety increased, this can be common with all AD's though, worse before better, I did persevere for 7 weeks but had to come off them, been off just over 2 weeks now, had a few lows and still high anxiety but can't say for sure if it's related to the Mirtazapine or not. I use rescue remedy mouth spray which I find does help. Maybe you need to go back to your GP x