Hi, I am Dr. Jeff. I will try to help you. Please feel free to follow up if any more information is needed. When older cats seem to be losing weight but have an increase in appetite, hyperthyroidism is a concern. This can results in weight loss, poor boat, increased vocalizations, vomiting, heart murmurs which increase the likelihood of clot events, hypertension which can lead to blindness. The behavior you are seeing tonight could be a result of sudden blindness or a clot like event. Certainly other issues like cancers, kidney disease, liver disease, toxins, etc are possible, but based on your description, hyperthyroidism is my top concern for all of these signs. If you note that her pupils look very large, blindness is possible and I recommend a vet visit as soon as possible. In some cases, signs can be regained if the high blood pressure is managed. If you feel she can see and a ER vet is not possible, try to provide comfort and containment as best as you can so she cannot hurt herself.
There is no other home remedy I can offer at this time.
I hope this helps and gives you direction.
thanks
Dr. Jeff