My 12 Year Old Dog Is Panting, Pacing, And Crying Every Night. She Only Wants To Be Outside, But I Don't Want To Leave Her There All Night. Can Anybody Help Me With What Could Be Wrong With Her?

Your dog is in pain--panting, pacing, and vocalizing are all signs of pain.  There are many things that can cause pain in an older dog.  Some common problems include cancer, kidney failure, liver failure, trauma, and severe arthritis.  Please have your dog examined by a veterinarian so the cause of her pain can be treated.  I would not allow her to be outside all night.  This can also be a sign of pain.  I am afraid her body is not at a point it can be relied upon to regulate body temperature.  I do not want her getting hypothermic on top of her underlying medical condition.

She is probably experiencing some Cognitive Dysfunction (Doggie Alzheimers) that is affecting her wake-sleep cycle. See a vet for possible different meds that may help. In addition, I would highly recommend some blood testing to check for any underlying problem such as Cushings and hypothyroidism