Oh yes, I've worried about those things, too. That's why I suggest conquering your travelling fears in baby steps.
My first mini-vacation was to a friend's AirBNB house only an hour's drive from my home. Granted, I did have my husband with me, so I wasn't feeling as insecure as I would if I were travelling alone. The trip was a piece of cake, and very relaxing.
Having had your ileostomy for about 10 years, you're probably pretty experienced with all manner of possible mishaps. Have you been prone to blockages or getting sick in the past? If not, managing your ileostomy on the road isn't much different than at home. With regard to food, you can have menus modified in most restaurants if need be.
As for getting sick, unless that happens often for you, I wouldn't worry too much about it. Just make sure to get the extra Blue Cross or OHIP coverage, which will ensure your hospital bills are covered in the unlikely event that you DO get sick.
Your anxiety over travelling is quite normal, but the more you do it, the easier it will become. Maybe start with a weekend trip closer to home, then a full week, and so on.
My widowed mom, rest her soul, would take a cruise every other year, even to the places she was previously afraid of (like Russia) or adventurous Alaska or her favourite, Egypt. At the age of 87, with a myriad of health problems, she did it all!
Here's hoping you have a fabulous New Year full of wonderful travel adventures!
M
xo