Hi Sandy
Sorry that you are having a worrying time at the minute.
Lots of things can cause breast pain that is not cancer and I hope that is the case with yours. If you are worried though I would definately ask for another referral and state how worried you are and for them to perhaps do a breast MRI. I had pain in my breast and 3 clear mammograms even on the day of diagnosis I had a clear mammogram and ultrasound. It was only found through biopsy and breast MRI that is not routinely offered.
I did not just have pain though, I had an indent and my breast shrunk in size. I had to keep going back and it was on my third visit ! So I always say ANY changes or abnormalities need checking. Hopefully everything will be OK for you, because most visits to the breast unit do turn out to be nothing, Good luck xx