I had a stoma for 2 and a half years. My strong recommendation would be to not keep the rectal stump if it's going to be a permanent stoma. You can't feel it as such, but you can pass mucus and blood and have just as bad urgency as with a colon. Also, long term it is a cancer risk. No more so than a regular colon is, but what's the point of having it just sitting there gathering dust?
Energy, appetite, etc. were the same for me once I had got over the surgery and a couple of hideous drug withdrawals (oxycodone, which left me with ruinously itchy skin for months, and prednisolone). I had more of a psychological problem with the stoma, but looking back I almost feel like I would take the stoma over what I have now: I was physically healthier, had no Crohn's or uveitis, etc. I never physically felt the lack of a colon.
As you've already had a loop ileo for 3 years you should adapt pretty quickly to an end ileo. For most people an end ileo is easier to manage than a loop one.
Dx Crohn's in June 2000. (Yay )
Tried: 5-ASAs, azathioprine, 6MP, Remicade, methotrexate, Humira, diets.
1st surgery 20/2/13 - subtotal colectomy with end ileostomy.
2nd surgery 10/7/15 - ileorectal anastomosis. Stoma reversed and ileum connected to the rectum.
Current status: Chronic flare. Do I have any other kind?
Current meds: 50mg 6MP; Entyvio (started 3/11/16)