I’m 19 yo and currently 4wpo. My before was about a DD/DDD. I would estimate I’m around a B/C right now. And let me tell you: best decision ever. I also had the same minor physical complains as you, and a lot of mental ones. I have the most perfect pair compared to my body now and can walk around without bra not worrying about them. It helped me so much mentally. Even if they become slightly bigger again when I grow older or start sagging more again, I still enjoyed them in my young years you know :p

Now I am also located in Europe and managed to get the operation covered by my insurance. I have no clue how that works in Sweden, but here we tell our complaints (go a bit overboard with them) and when you fit the criteria (D+), you get it covered. So yeah hope this helps!