I’m miserable

I’ve taken my dog in the past few weeks multiple times. Vet said it’s unlikely to be cancer and sent her home with meds. She has a bump on her nose. She’s still sneezing here and there. No blood. She’s a chihuahua, 7 years old. I scheduled a ct scan on Wednesday because they don’t have the ability to do a rhinoscopy on a dog her size. I’m just horribly stressed out and don’t know what to think. I’ve been in a bad place since and I have horrible nightmares about her. I feel I’ve hit my breaking point and I feel completely alone.