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I have read your question ,and here is my advice.
Such type of symptoms are not specific for any disease but must not ignore, there cab be so many reason commonly as follows,
1)
Muscle disease (myopathies ,
myositis, checked with CPK, EMG)
2) Endocrine diseases, like
thyroid, cushing disease , etc checked with endocrine profile
3) Vasculitidis ( ESR, and special test if needed )
4) Other like chronic
kidney ,or
liver diseases can also cause the same , sometimes certain malignancy can cause it , so he would need proper and detailed work up, hopefully the pic is more clear after the blood tests comes back.
Hope I have answered your query.
Let me know if I can assist you further.