Something is wrong with my Lab, vet apt tomorrow, she's 15, help!?

She is senial and wonders aimlessly sometimes. She's slow to get up and sometimes needs help. But today she had a harder then usual time getting up so I helped her. She normally has a hugh appitite and finds food with her nose and by routine, ( she lost her vision mostly) I had to get her up again and to her food, but she did not eat her dinner, had some water and layed down snoring. She seems to be breathing well except some moaning. My concerns: Labored breathing with abdominal expansion, no desire to eat, no desire to pretend to play and a serious loss of balance. I had to pick her up and move her to her bed. I made an appointment with the vet for tommarrow afternoon, the soonest unfortunatly. At 15 maybe a stroke? Suggesstions until her appointment..........