Breast Cancer, Chemo and Sjogrens

I have Sjogrens and have had a masectomy. I am very concerned about the effect of chemo on sjogrens as this can cause a worsening of symptoms making it intolerable and necessitating permanent use of drug/s, 3 -4 times per day. If you have Sjogrens I would like to learn of your experiences with chemo/Tamoxifen and Radiation. If you are not on medication for Sjogrens, I would particularly like to hear how treatment affected your condition, whether permanently or temporarily.