Can a severe urinary tract infection cause body aches and swollen lymph nodes under arm pits?

No: A urinary tract infection could cause bodyaches, but i doubt it would be responsible for enlarged axillary lymph nodes. More than likely some other condition is going on to account for these lymph nodes. Conditions can co-exist together. Look for something other than UTI to explain the nodes.

No: Swollen lymph nodes under armpits suggests a more systemic problem. You need to see a doctor.