The common cause of swelling in armpit is enlarged
lymph nodes. Cysts and infections of the armpits can also cause enlarged
lymph nodes in armpit. Other causes of armpit lump are cat scratch disease, lipomas, infectious mononucleosis, lymphomas and breast cancer. Vertigo can be caused by inner ear problems, neck injury; migraine etc.You should see a primary care physician. After a general examination your doctor may refer you to the concerned specialist based on the clinical findings.