Should I get my breast resized for medical reasons?

I'm 4"11 and my breast size is a 40 DDD. I'm always dealing with back problems and shoulder issues...

Everyone around me supports my decision to get them resized except my husband

But he doesn't understand the dark circles under my breast or the indent lines on my shoulders from the bras or the heaviness of them when they sit on my stomach

And mentally Its hard to enjoy simple things like running at the gym on the treadmill without them flapping up n down n Everyone seeing them or running at the tennis court n my breast making this slapping sound that my opponent can hear im not in shape but even when I was I always been self conscious about my large breast

Even as a kid I was the first girl with breast and boys always reminded me of that n to all the boys in school I went from innocent to a slut without doing anything.

All I'm saying is I feel like he's being selfish

I know my back will fill much relief afterwards. If I'm wrong and being selfish just tell me

How small should I go if I do?

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