Thanks for your query.
Very interesting history and question.
Noted that your are suffering from maxillary and frontal sinusitis
and has been taking Biaxin 500 BID.
You are also suffering from calcific tendinitis
and have started pain in the left arm.
When there is pain in the left arm, the first thing to do is to get one EKG to rule out any cardiac problem.
]Secondly the septicemia
or bacterimia one gets with sinusitis can cause the inflamed tendon to get the infection and pain.
You can certainly get operated to clear the calcific disease of the tendon to get rid of the problem.
This is not a side effect of Biaxin.
Cary on proper treatment, you also have to take an anti-inflammatory and decongestant medicines as well as nasal sprays for sinusitis and may be an added antibiotic for sinusitis; Blood tests and CT scan
of the sinuses
and prescription based treatment from your ENT Surgeon.