Dear N. Manning:
It is difficult to tell what may be going on. What does your physician thing is going on? The night sweats is not a normal occurance, have you always had this or is this recent (since the arm pit pain). If the pain worsens with movement or coughing then it might suggest that it is a cervical cord problem, if you had a recent viral illness, you might have Parsonnage-Turner syndrome, the fact that you have a swollen lymph node might suggest a isolated myositits. As you can tell the possibilities are almost endless. Without doing the exam and seeing the previous lab workup, your symptoms are too non-specific to make a diagnosis over the internet. I would suggest seeing a neurologist.
Sorry, I wasn't much help.
CCF Neuro MD
Dear N Manning
I have had the same pains in both armpits . The problem
was four blocages in my arterys supplying my heart. Every time
i did heavy working igot out of breath and it would some time
bring on this pain in the armpit. I had heart bypass and i
feel fine now no more problems . I am not trying to scare
you but see a doctor and get a stress test .
Hope I,ve helped
P S The doctor thaught my armpit pain was rare but not unheard
off .
thanks for the comments.
CCF Neuro MD