Totally understandable that you would fret at this stage, worry that it may have been a false alarm, and the surgery was unnecessary, and without having all the information. Beginning to understand you and your thought processes now, but, but, but wait until the pathology results are through and then, and only then, will you know what you were carrying.
As for regrets, well it can not be put back, so maybe you can get used to the idea and concept of your new prolonged life? Lots of things may be different, but believe me regular great sex after RRP is possible. Maybe you were only at it every day before the op? I have had to deal with a far less regular sexual active life than I was having pre-op. But I am making do, grinning and bearing it, putting up with my frugal sex life with barely a moan or a whinge,and just having to accept that I can only do it four times a day. Life is tough, but at least it is a life without cancer.
did I say "great"? It's not great it's ydoolb marvellous. ;-)