I have had Thryoid problems since February of 2004. When I have been off of my medication for 1-2 weeks, my menstral cycles become heavy. When I get back on my medication, the bleeding stops. I haven't had a Well woman check up in 10 years. Should I get a full check-up and What is going on? I hope that this isn't Polycystic Ovarian Syndrome or Uterine Cancer.