My dog died and Im so upset. I dont know what to do?

My dog of 16 years died today. My dad took him to the vet. He had tumors on his lungs. Im so upset. Im an only child and he's all I ever had. I didnt want him to suffer anymore. My 5 year old jack russel also has glaucoma this week but she's okay. I worry about her now. I feel weird because Im not crying anymore, i dont know what to do.