Given the data you provided (pain in the armpit and in the jaw, feeling hot in the night, no swollen lymph node might be found), you might have experienced inflammation of tissue close to the armpit and the jaw. Throat infection might cause inflammation of the neck lymph nodes causing pain that might spread to the jaw. The next location where the infection might spread and the lymph nodes try to fight it, is the armpit.
Feeling hot at night is not a symptom that is serious, but you might check whether there is night sweating, which may indicate a more serious condition.
You might want to have a simple nose and throat swab with an antibiogram to determine the exact bacteria and the most effective antibiotic. A complete blood count is recommended in order to check for changes in the blood that might indicate more serious conditions affecting the lymph nodes in the whole body.