Hi, I am writing this for my mom. She is 60. She feels chills in her back and occationaly in shoulders ad well. The chills recur 2-3 days a week, for almost one year. They are the worst in the morning and as the sun rises she gets better by noon or 2.00 PM, though sometimes the symptems repeat later in the day as well. She feels the chills internally even when the external conditions are warm and she feels warm externally. She also feels loss of apetite when it happens and has a constant vomiting sensation.
She was tested for maleria, Thyroid hormone disorders and general anxiety. The test results are negative and rest of the general tests such as blood pressure, blood sugar etc are normal. Is there any other condition that would cause such a symptom ? What tests we could take to confirm it?
She experienced this condition first time 12 years ago and she came out of it after couple of years and tons of medications, though we are not sure which one worked. This time it is worse. She received a blood donation just before the first occurance of the condition. So we are not sure whether it is a type of allergic reaction from her body or a viral infection of some kind. Any suggestions are very helpful. Thanks in advance for your time and kindness to share.