I'm so sorry. That sounds horrible. Is there any way you can get an ostomy nurse to see you asap? You are in a crisis, both with your skin and with your lack of supplies. I don't understand why your doctor is just telling you to be strong, rather than finding some immediate and practical help for you.
Do you have anyone helping you? A parent or friend etc? You need help, asap, and having an advocate who is not in the same crisis that you are might help you get it faster.
Definitely call the companies for samples and see if you can get a hospital to give you some supplies. You could try just showing up at the ER if the hospital you had your surgery at is far away. This isn't 1940, you shouldn't have to be improvising a pouch substitute (I've read about how people used to use things like hot water bottles and tuna fish cans).
I agree that the problems could be caused by your stoma shrinking. Have you been measuring before you cut? I found out my stoma was oval, and I didn't realize it .... it's hard to see looking in the mirror.
I had leaking problems at about the same time after my surgery. My nurse switched me to a convex wafer, and that, along with cutting the wafer right, pretty much fixed the problem. Have you put on weight? If your belly is a bit soft or round, or if your stoma is short, a convex wafer might help. You could ask for samples.
You do need something to help your skin heal. It's much better if a nurse can look at it. Your skin needs to be treated and then you need to get the stool off of it, so it doesn't keep getting worse.
Thinking of you. Hope you get some help and some relief soon.
48 years old, female.
2004 dx indeterminate colitis. Back and forth between Crohn's and UC dx. Many drugs, minimal success.
2010-11 Crazy skin and eye complications, high fevers, bad flaring. Out of good drug options, tired of scary drugs.
Feb 2011 -- proctocolectomy with permanent ileolostomy; abscess, blood clot. Still healing, still glad for the surgery