I understand your predicament, and appreciate this must be terrible for you, but the only thing you can really do is be patient. They are looking at the application, which means that something is being done, and the fact that it needs to be referred up, while delaying matters, at least means that it has not been refused.
When a relative is helping out financially, they usually like to see three months of bank statements, so you may want to prepare for this.
I hope everything works out, and that your son recovers.
Victoria