Pika on pain killers

Hey all, this morning when I got up Pika was sitting on my pillow staring at me. I took him and Aptiva outside and when he was coming in he was crying out like he was in pain. Last year at the same time I took him to the vet for the same reason and she gave me some pain killers for him to take. I gave him one but he seems to be in pain. I held him for a while because he won't lay down or sit down. When I took him to the vet last year she told me to carry him up and down the stairs for 6 weeks.