As you're in the UK, not sure if they're currently doing it but M&S will do a proper bra fitting/measuring. They'll check you've got the right size, and find something that will fit and support you better. I saw your other question. In the long term there's reduction surgery if they become problematic or give you back pain. There's a user on here - think her names queenofscotland or similar, might be worth talking to. She's similarly well endowed, might have some advice.
You're definitely not a 36GG. I highly recommend measuring yourself. Also, avoid M&S, they tend to measure people wrong, like a lot of stores do.
Breast reduction... I know a couple women that had to have it
lmao you literally need to loose weight
There*
Superb Opinion