My other concern based on the information you have provided is a back injury or pain. Not necessarily doing something like jumping off the furniture and crying out, they can be walking around the house and have a disc herniation because of their anatomy.
Here is more information on this condition:
Ideal is to have your veterinarian evaluate your dog to definitively diagnose the problem and start on appropriate medication to control the discomfort. Until you are able to do this please restrict activity (which often they are already doing themselves but that means no steps/ stairs and only carrying to go potty) and rotating warm and cool compresses on the back and neck in ten minute intervals to reduce pain and increase blood flow.
You can also do light circular massage up and down the back and neck to stimulate blood flow if this is not too painful and will allow it.
Please let me know if you have any additional questions I can assist with. I hope you are able to get your dog comfortable soon, truly. I am online another 15 minutes tonight
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