Welcome to HCM.
As you mention you having arthitis especially involving large joint i e polyarthitis and elevated aso levels.
Firstly I wana ask do u have fever,rash,any abnormal movements??
May be possibility of rhematic heart disease.There is no history of streptococcal throat infection
of patient of rheumatic heart disease
As you mention fatigue
,its very common symptom of mitral regurgitation
which is most common in RHD.
So my advice is consult your cardiologist and do baseline investigation in form of chest x ray pa view,ECG,ECHO.