Why don't you define "bad experience" by telling us a bit about yourself, just as much as you are comfortable with, then maybe we'll get a better idea of what info you're looking for. I don't think a mastectomy could ever be a "good experience" but we've just to get on with it.
Oh and I have had one so I know what you're going through.
Come back and chat to us though, you are not alone
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