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Shingles is very unlikely to cause the symptoms that you are mentioning
I would recommend further testing for these symptoms, but I am not sure if any particular tests have been done till now, since you have not mentioned any,
I would recommend further tests like an EKG, ECHO, stress test, and chest X ray as per clinical examination to try to find the cause of the symptoms that you are describing,
A cardiologist and a pulmonologist would be appropriate specialist to help you in this regards
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