After surgery, it took me a few days to regain my strength and start moving around and probably a couple more till I was confident to potter around and start doing bits and pieces by myself. It's a pretty slow process that initially pissed me off, but it's all good really; things take time.
I couldn't say what effects the surgery will have for you. My understanding is the reasons people have ileostomys vary from person to person. My CD diagnosis came a couple days after my ileostomy and numerous other procedures that took place during a week or so.
I found weight pretty easy to gain, despite losing a lot during hospital. The difficult part I had was my taste buds were absolutely ruined so it took a couple days until I could tolerate tasty savory things, and a couple weeks before I could manage a curry. Other than that, I've just eaten whatever I wanted. Actually, I'd say that being able to eat whatever made me feel quite a bit better. Make a note of the effects of certain things though, for example some fruit juices will go straight through me whereas white wine will take its time.
I felt better within days, and I'd say I'm improving each day since.
All that said, everyone seems to have different experiences, but good luck with it.
