I have had several partial blockages in the many years that I have had my ileostomy. And I too believe that the culprit of your blockage was the chex mix. Not something that I would recommend on an empty stomach. Coco wheats is not a bad choice, but include something to drink when eating them. (I love coco wheats - even at 47). Think about
this - coco wheats absorb water --- that is how you cook them to be able to eat them. Just like oatmeal. So it stands to reason that they will absorb some liquid as they travel thru the digestive tract too. Add some additional liquid to that meal, like a cup of tea or juice, or extra milk on them. Milk is safe but some folks get gassy with it - not a blockage tho.
Here is a simple test... one to think about
whenever you are unsure of whether your food might cause a blockage. This was passed on to me by a very knowledgeable surgeon many, many years ago. Sounds silly but it helped me think about
"safe" foods to eat when I first had my surgery. If the food will dissolve in a glass of water or break down to a very soft food (except for meat - stomach acids will take care of it), then it is a safe food. Think of pretzels. They are hard out of their package, drop one in water, and they become "mush". But then, think about
popcorn or any type of nuts - they retain their shape. Maybe this will help you pick your foods until you adjust a bit more. If you want to try your chex mix, I'd recommend doing so With another food, ie a turkey sandwich, and drinks lots of water with it.
Same thing has happened to me --- throwing up does "push" things thru when using your stomach muscles in that fashion. Doesn't feel very good, esp on a new incision. But, thankfully, you didn't have to have any other intervention to release the blockage.
Best of luck to you and keep in touch,
Diagnosed with CD in 1979, many resections and meds
Perm Ileostomy July 1984 at Cleveland Clinic
Disease free since surgery