Just had 1st of 2 step j-pouch surgery, need advice.

I just had my temp illeostomy surgery in preparation for a J pouch 2 days ago on the 5th. I didn't realize how quickly things would go through me, the amount of liquid and how quickly it would fill. I know this is supposed to improve, but can someone elaborate on what i should expect? I'm already pretty skinny and worried that I'm not going to eat very much if things don't improve significantly.

Unfortunately this is the nature of a temporary loop ileostomy. Mine ran like a faucet 24/7. You could try Imodium. (Check with your doctor first though) I didn't like the Imodium personally. It made my output too thick and glue like so it was impossible to empty the bag.

Just make sure you drink plenty of fluids each day. And eat properly. I could not gain weight while I had my ileostomy. And I ate a lot of calories! But that all changed after my takedown surgery. I gained the weight I needed to gain back but it took about six months. Now I have to be careful and exercise to maintain my weight or I'll gain. But yeah with my ileostomy I was skin and bones.

Good luck!

It will slow down, but mine took about two months. By that time you may be close to your "takedown". As said before, watch the sugary stuff. It's probably obvious, but avoid spices and raw vegetables/vegetable skin. Also, steer clear of caffeine, man that stuff is the devils urine to a loop ileo! Good stuff includes porridge (oatmeal), mashed potato, boiled/ steamed rice, apple sauce, white bread, peanut butter, chicken, rice crispies, rice cakes.
I know it's hard to hear when you're suffering, but it really does take patience and some experimentation. And it is possible to gain weight with a loop, I purposefully gained over two stones before takedown, as I knew I'd lose it after. I find it much harder to gain weight with a j-pouch, as I have lots of issues, but that's another story, and not what you need to hear right now.