It's going to be okay! ((BIG HUG)) The internal swelling is temporary and will go down, and you will be able to pee on your own again. It just takes a little while sometimes.
After they took my catheter out, I would just sit on the potty and wait while it barely trickled out. It was like that for the first couple of weeks, but improved as the swelling went down. Once that happened, the flow slowly increased, and it kept improving until it was finally normal again. I was worried that I would not be able to pee normally, too, and my surgeon did not prepare me for that, so I know what you're going through.
Do you have a home health nurse coming to check on you? Did they say when they might take the catheter out, so you can try to pee on your own?
Isn't it nice to not have to RUN to the washroom anymore? You'll really appreciate that once you're feeling better and are out shopping for food or clothes. It's wonderful to not have to know where every public washroom is in town!
Hang in there. Everything is going to be just fine. You had major surgery and was sent home very quickly. Keep in touch with your surgeon and ask for a home health nurse, if they haven't already arranged for one to come to you. Keep us posted on how you're doing, and make sure you're drinking plenty of water, so you don't get dehydrated.
Dx'd Crohn's in '99 at age 28. Proctocolectomy and permanent ileostomy in '06.
Disease-free and medicine-free since surgery and very thankful to be healthy again.