Have you got professional bra-fitting? If you don't want professional, there are online resources like https://www.abrathatfits.org/calculator.php
It should make the back aches much better and breasts in a correctly fit bra are usually less conspicuous - not shaking, not flooding out of the neckline, just being there.
British bra market is well-accomodated for large sizes, so if you can get reasonable shipping from UK, go for it (I've used brastop and ebay).
There are some tips on clothing, too, like avoiding turtlenecks and halters and choosing open-front jackets, v-necks and wrap necklines.
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Let's not confuse being normal with being mentally healthy.
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