Crikey that must be tough on you so first of all {HUG}.
Although my dd doesn't do it on a regular basis if she is feeling under the weather or teething even if I have settled her back down as soon as I try to leave the room she seems to sense it and gets upset.
Is it worth trying leaving the room in stages - so start by just moving away from her cot and if she stirs reassure her with your voice, then once she has settled again move a little further away and again if she stirs reassure her with your voice. Continue doing this until you reach the door and hopefully after a few nights she will be reassured and you can cut back until you can leave the room in one go.
Just a thought and hope it helps.