Hi Rhian! There are a couple of other threads about food: "Foods I miss" , "Things that go down good" and others ... have a look, if you haven't already.
Didn't your doc, hosp, give you some literature?
2 main 'rules' are to eat small portions and to chew well ... till you've got mush in your mouth. Don't let yourself get ravenous -- keep something in your stomach. I carry some water crackers that I chew to mush if my tummy starts to growl.
Absolutely no nuts, popcorn, mushroom, onions (some tolerate them, but those people are in the minority).
Some do bananas well ... they're just ok for me ... feel very heavy. Canned mandarine slices and canned peaches do best (on top of low fat cottage cheese - yum

)
Watch the vegies ... I can only take well cooked carrots, broccoli and cauliflower (last 2 give gas big time tho). The days of nice big raw salads or crispy stir frys are over.
Meat - small well cooked portions (business card size) chewed well.
I don't do spices well. No fizzy drinks

. One serving of low fat milk (in a latte) is fine.
White bread, pasta, rice are my friends. If I feel cloggy ... a meal of soup (tomato or potato with crackers are my favs) or a cup of coffee seems to get it all going again.
Don't know if this happens with others ... but if my digestion isn't doing well, I find I have a slight headache and am 'twitchy' - just not feeling right.
This is what is working for me ... hope it gives you some ideas.
You can look up "low residue diet" on google -- good info there.
Beatrice
p.s. I hear you about work/illness and stress. I worked through 25yr of ulcerative colitis and then left a great job at 40 because of it. 15 years later, here I am with an ileostomy. I have so many interests that I'm loving this non-working life. Almost each day I think "I'm so lucky not to have to work - many don't have the option of quitting".