Skyy, the injection of the dye is painful. Just grit and hold your breath and you get through it. Once the injection is over, you don't feel anything. Don't be alarmed if your urine is blue, for a while. It is just the dye.
I had my lumpectomy on a Friday, with node dissection, and was out and about, attending a basketball game, on Sunday. Mastectomy and recon took a lot more recovery time, but I was out shopping on day 10. Wishing you an easy and speedy recovery.