Dear @Lisa_E66
Your emotion is probably at least in part due to everything you have been through to this point. It can catch up
with you, especially if there is a trigger. It’s also about reality - you are wearing a prosthesis, it’s not you, it never will be and not unnaturally that makes you sad.
I too had big breasts - I didn’t manage to get a prosthesis for 12 months because of a persistent, large seroma and when I did, I wondered how I would ever manage. I was sick of a soft pad that never stayed put but it was light and generally inoffensive. The prosthesis was big, pink, silicone-y and unwieldy. I thought I would never get the knack of inserting it, even tried putting it in before putting my bra on - that was like trying to manage a brick in a sock! But it got better, and easier. That was nearly eight years ago - no reconstruction, have a swimming prosthesis too (the sports model!) and comfortable with it all.
I assume you have had a professional fitter? That can make a difference. Mine proposed a bra I would not have chosen myself but which turned out to be both comfortable and improved my posture.
Just give it a bit longer. You’re expecting yourself to adjust to a lot of things in a very short time. You want the old you back and the prosthesis is a reminder of the change that has occurred. Normal? You bet! And don’t be sorry, we all need to kick something (preferably inanimate) from time to time. Best wishes.