I am so sorry you are going through this with your kitty!
Until you are able to get her to the vet, you are going to need to make sure she keeps eating, even if you have to force feed her. She needs to maintain her strength, but with cats, if they stop eating, they are prone to developing feline hepatic lipidosis or fatty liver disease. Some cats can go without eating for quite a long time without developing this, others develop it after not eating for as little as three days. They don't all develop it, but it's not worth the risk to find out, so even if you have to pump a meat-based baby food into a syringe and squeeze it into the corner of her mouth to get her to eat, you need to do so to keep her healthy until she can see her regular vet.
Blindness and deafness can be associated with a stroke, but it's odd that there are no motor skills affected at all. I don't want to scare you, but it's possible there is some sort of mass growing that could be pressing on nerves and affecting the sight and hearing. Nothing can be said for sure until diagnostics are run, so it's really a shame that there is no vet that can work with her available for such a long time. Is there nobody in a neighboring town that you could call? Who is covering for your own vet while s/he is away? I can't imagine any reputable vet would take off for such a prolonged period of time without making arrangements for their patients. If that's the case, you need to look for another vet anyway, because this one doesn't sound very responsible.
How in the world did your cat get exposed to carbon monoxide??? I just did a quick yahoo search on symptoms of it, which took a total of only 2 minutes, which confirmed what I suspected that CO poisoning causes blindness and deafness. It said sometimes it's reversible.
As for leaving the hyperthyroid untreated, this can be very dangerous and I don't know what vet in their right mind would agree to that! And, once again, a very quick and easy yahoo search of untreated hyperthyroid disease can lead to heart failure, kidney failure, and high blood pressure. By the way, high blood pressure can also lead to blindness if it's high enough. This condition left untreated puts so much strain on the heart-the heart rate increases big time and this can cause the heart to fail.
Whether kitty gets PO'd or not over a pill, your cat's body will be a lot more stressed by NOT treating it. Of course cats hate getting pills, but they will get over it and will feel so much better.
I'm not a vet, but I'm going to bet that you'll see a huge improvement once you get the thyroid condition under control. I'm also going to guess that the blindness and hearing is not caused by a stroke, because there is no weakness in the legs! Let's hope that it's only temporary!