In the middle of my cycle I experience cramps - like period pains and they last for 10 days. This started 9 months ago once I had started Tamoxifen. I have just had a laparoscopy and had cysts and endometriosis removed. But, to my mortification, the pain was there again some days later in the middle of my cycle. I am 41 and had chemo, I have slightly irregular periods and the occasional hot flush. Has anyone else had this odd problem?