Left inner arm node swollen and and hurts been going on for few weeks but has been really painful today? sharp shooting pain up to armpit

Swollen node: Your body is telling you there is something wrong, possibly infection, inflammation or another cause. See your doctor for an exam today. All the best.

Needs to be checked: It seems you may have infected Lymph nodes and it is better you get it checked by your doctor as you may need Antibiotics after evauation, You have had it for few weeks.It is about time you get it checked There are other possibilities as well and that is why a detailed History and Physical Exam is needed