Thanks for posting your query .
is generally a diagnosis of exclusion . Since you have mentioned that you have a high ESR and you have been diagnosed by a rheumatologist
there is a high possibilty that you suffer from this disorder . Steroids
are the sheet anchor of this disease , and lowering of ESR in response to steroids is a diagnostic criteria for this disease. you can experience vague bodyaches and fatigue
in this disease . Probably hernia
added to your already existing discomfort and its surgery gave you relief , but it has got no impact on polymyalgia . I advise you to follow the advise of your treating doctor and stay in touch with a rheumatologist for your disease.
Wish you good health.