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Hello, I'm sorry to hear about your dog.
It does sound like she is painful. Greyhounds can often times end up with broken bones when they fall down the stairs. In an older dog like this, I would want to do a full exam to see why she fell down the stairs. I would want to make sure it's not secondary to some type of organ disease, cancer, vision loss, seizure or heart disease. If it's just that she stumbled and fell, some pain meds (Rimadyl, Tramadol, Gabapentin) may help relieve the signs. I usually go with some type of combination in greyhounds as they don't tolerate pain very well.
I hope this helps, let me know if you have any other questions.
You will need to get the meds from a vet.
For now, you can give 0.5 mg of Alprazolam (Xanax). That will help her sleep and calm down. If it's not helping, you can go up to 2 mg.