(20/y.o. male, 134lbs. Never had a major illness) I had a sore throat a while black, nothing to severe ( I think) I could still talk and had a slight cough, after that went a way a few days later I had a swollen lymph node under my left arm that lasted for one day..it caused me to have a hot flash in the middle of the night, but no other side effects. Should I be worried it can be something serious? and can both the cough and the inflammation be connected?