It's a lot to take in at once! Practical responses - I was a similar breast size and had a mastectomy. Always wore a bra with underwire and did so, because it was perfectly comfortable and no one told me not to, for 12 months afterwards. I was really dubious about support without an underwire but a trained fitter when I finally got a prosthesis, showed me otherwise. No, the colour options weren't great but it looks and feels good. I wore a pad until I got a prosthesis - depending on your circumstances, it would be worth investigating a partial prosthesis as pads, which are very light, are a pain - move around much too easily, you may be initially hyper sensitive about your altered boob and readjustment syndrome (constant tweaking) you can live without. I did swim with a pad, just tucked it in my swimsuit but I wasn't wearing anything too revealing. I did chemo, wore a wig and most people outside my immediate work team, didn't know anything. You'll be amazed at your additional
imventiveness, hang on to your sense of humour, it can get you through some crazy times. Best wishes.