I've been experiencing symptoms the last 2 months. i have numbness in my arm, swollen gland in armpit, sharp in right side of back, extremely tired. ?

Neurologist: Inflammation of the brachial nerve(brachial neuritis) can cause this pattern of pain. Impingement of a nerve root at a vertebra by a disc or spur is another possibility. I recommend an evaluation by a neurologist. Xray, mri,emg are studies that may be recommended. Your physician can check your armpit for pathology as well as enlarged lymph gland is not usually an associated finding.