An ileostomy is for UCers when the entire colon is removed. The ileosotmy is created with a portion of the small intestine. A colostomy is done on Crohn's patients, for diverticulitis, and other reasons, and is done when there is a partial colectomy (not taking all of the colon) or when a resection is done on the colon and the surgeon deems it necessary to divert waste for healing purposes. So, you will be having a permaenent ostomy.
As for pre-surgery prep and admittance, every surgeon is different. My pre-prep started at the hospital as I was checked in as a patient at noon the day prior to my surgery. I started taking the laxative and also had pre-surgery blood work. Some surgeons have patients come in the early morning of the surgery and have their prep done at home. There is no way to know which way your surgery will work. I would mention your prep concerns to your surgeon, chances are he/she will work with you if they can. You have a complicated health history so there is no guessing on which way this will go.
Do you mean a self-irrigating ostomy? If so that would be a Kock pouch or a BCIR. Both of those are internal pouches created out of the small intestine and one uses a catheter to empty. It's a far more invasive surgery than the permanent ostomy and even more difficult, I believe, than the jpouch. Neither of those surgeries are offered at many hospitals meaning that travel for surgery and for possible complications must be considered. I know the Cleveland Clinic does the kock pouch and I know that there is a hospital and Florida that doe the BCIR.
Someone else will come around and help you with ostomy questions. I had mine for only 8 weeks and never mastered it! I'm glad to see that you are having surgery as I believe this will give you more of a life and one less thing to worry about. You will be shocked at how much better you will feel immediately after surgery once that nasty colon is gone!
dx proctitis in 1987
dx UC in 1991, was stable until 1998
1998 started prednisone, asacol, pentasa, nortriptylene, ativan, 6MP, rowasa enemas and suppositories, hydrocortisone enemas, tried the SCD diet, being a vegetarian, omega 3s, flax, pranic healing, yoga, acupuncture, probiotics
2000 lost all my B-12 stores and became anemic
2001 opted for j-pouch surgery- now living life med-free