Oh bless your heart topsy, its OK to feel like that, don't get upset. Tell them -, honestly, they will be really understanding and do everything they can to make you feel comfortable.
Its a really natural way to feel after mastectomy and you certainly won't be the first person to feel bothered by the idea of undressing, so don't be embarrassed, let them help you through it.
Now - what have you got lined up in the way of a treat for when you done all your hospital business tomorrow? Mystic Kurri is looking into her crystal ball -- whooo whooo 'I see chocolate, ..... I see creamy things...... I see something red in a bottle.....'
xx