"Estrogen dominance" is an odd term for a GP to use. 
Whilst estrogen can cause breast tenderness, think about the time in your adult life when you were slimmest, and what estrogen levels you would have had. 
Have you explored any other causes of weight gain such as thyroid issues, other medication or change in circumstances leading to either increased energy intake or reduced expenditure?
You could always try an intermediate dose by cutting off one edge of the 75mcg patch to reduce its area by about a quarter. 
There may also be scope to modify the progestogenic component if relevant. 
Additionally I was given a tip many years ago by a very well renowned gynaecologist about taking evening primrose oil capsules and a vitamin B complex to get rid of premenstrual breast pain. 
I didn't think anything available over the counter would be worth s*** but decided to humour him and try them. 
It worked so well that I was no longer getting any warning when old aunt Flo was about to show her ugly face, and got caught short a few times!