Some people, without the option of quarantine, will roll the dice on boosting the health and immune system of the fish. Feed live or high quality frozen food, don't make any changes that might stress the fish further, etc. It's not a solution, but it is a method some people choose to try.
If all of your fish die, then you just wait the 10 weeks before adding new ones. It sounds morbid but it is part of dealing with this disease.
You can also see if a friend has a small tank you can set up with a heater and air pump so you can medicate.