Veterinary question about my dog.?

My dog is a 4.4 pound Yorkshire terrier, usually very healthy and spunky, sometimes she has mild seizures but not often. Today she started acting odd and breathing a little hard, had a seizure went limp tongue dark color and then came back to breathing right, then almost threw up i rushed her to my veterinarian and they did blood test chest xrays and other xrays, something happened and she does not know me now and they thing she is now almost totally blind as she does not respond to light and she does not know me, she can still walk and hear but is real agitated and moves her head and mouth odd, does not rspnd when i call her or talk to her and she is an extrememly mommy girl. had not medicine at home, not any type of poisons exposed to, and not sure what happened. Anyone else ever had something like this happen? She is on medicine at the vet to help her relax and also in a chamber with oxygen as her oxygen level was only 71 and 85 percent when they checked it today, also her stomach was full of air on the xray. My heart is so sad thinking she may not get well, I rescued her when she was five years old and she is now 10 years old.