Hello I have studied your case All your symptoms suggest systemic infection leading to pain in arm pit. Enlarged lymph node around neck and shoulder needs to be evaluated. Most common reason for enlarged lymph node is usually infection, so we can start antibiotic regime and look for results. You may need to investigate in form of complete blood count, ESR, CRP, tuberculin test, and Fine needle aspiration cytology. There could be possibility of infection like Tuberculosis or sarcoidosis. So I will advise you to consult a specialist and do required investigation. Hope this answers your query. If you have additional questions or follow up queries then please do not hesitate in writing to us. I will be happy to answer your queries. Wishing you good health. Take care