It is good that your doctor is going to check your uterine lining to see why it is thick. The good news is that it usually takes up to 10 years of uterine thickening to turn into cancer. So while cancer of the uterus is possible, most likely it won't be. But it still needs to be diagnosed and treated.
Talk to your doctor about lower dosages of estrogen and progesterone that might not cause the bloating. Alternative choices are also available. Working with your doctor should end up with a good outcome for you that is both effective and comforable.
Machelle M. Seibel, MD