Hemorhoidectomy scheduled

I have a Hemorhoidectomy scheduled for Friday. I was told I have a grade 3 Prolapse hemorhoid. I have had problems with tis for the last 15 years or so, and recently has been more than I can bare. I have had this mass like thing that resembles a Cauliflower (bumpy and probably 1-1/2 dia.) that comes out during a bowel movement but have been able to push it back in for after. Been living with that for 15 years but recently have had The nasty purple bulge (hemoroid next to it). I am wondering if I just somply change my diet to increase fiber intake, and do the sitz baths if this will help me to shrink these and maybe not have to endure such an invasive precudure. I have also been reading on the natural remedies such as HEmClear product. I want to do anything I can to avoid this surgery and any help would be greatly appreciated. Thanks.