When my stomach swollen & heavyness then my breast also swollen & become heavy why it happenes.i have small hiatus hernia + gerd.

May be 2 problems: The symptoms you describe may be 2 differnt problems. The abdominal bloating and breast heaviness may be related to changing hormones, specifically the estrogen and Progesterone levels. You should see your gynecologist for an exam and to have your hormones checked. A hiatal hernia and gerd will give you symptoms of reflux-heartburn, chest pain, chronic cough... It does not cause breast swelling.