I feel so sorry for you. The quality of your surgeons and care are terrible. I have a love hate relationship with my small stoma which has caused two trips to the Emergency Room, but then again, that's why I chose the RNY instead of the sleeve, to punish me if I'm not perfect and has paid off with great weight loss success.
Please pursue all legal means against you surgeon and caregivers that your legal system will allow, in the U.S. the legal system bullies the medical profession so the doctors are very careful and make things right. If you are stuck with the large stoma, hopefully you don't feel real hunger and can at least use that "tool" to limit quantity of food consumed and log every thing eaten to control your weight.