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To start with, this is very unlikely to be heart-related. Musculoskletal etiology/source is still the most likely. CT scan of the chest does not exclude skeletal source. It only excludes anatomical pathology such as a mass or organ enlargement. Skeletal pain it typically a result of muscle or joint strain/inflammation. The symptoms your described do not point towards the liver, though they can not exclude it without liver tests. Shingles is certainly possible, even without skin lesions, but skeletal source is the most likely and can linger around for quite some time, specially if the trigger, such as bad position or certain repetitive movements or heavy lifting, persist. You may take advil/motrin 600-mg TID for few days. It does help
If you are still concerned about your liver, discuss it with your family doctor and get liver function test and hepatitis profile, both are blood tests.
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