I went to an Ear nose and throat doctor because I had a sinus infection (which originally I thought all this craziness was due to) so after we cleared that up and I still had (and still do have) tons of sinus pressure, she told me that hormones can effect your sinus. and just because I am writing, I don't have a tilitted uterus.... I am sorry to hear that some of you had it go through your uterus, that had to be painful.