Armpit feels swollen

Hi all 

my first post on something like this ! A week ago I woke up with tender swollen armpit on my left side ... slowly the overall swelling went down and I could feel a lymph node . This hunga round till this weds so just over a week but I'm left with this full feeling just really aware of my arm pit ! Dr said she thinks it's a reactive node but I'm worrying myself ! I've also googled !!!