Symptoms of boil under arm pit

about 2 weeks ago i woke up with what looked like a boil under my arm pit.under the boil there is hard knot.i went to the er and she said it was an infected hair follical that turned into staff . with out doing any test or blood work she stabbed a needle in it with a plunger like tube and tried to suck it out. she got nothing but a little blood and this piece of white stuff like fat tissue. they told me to go back after 48 hrs i did but hurting more then ,then before.they didn\'t know why i was there,so i had to tell them,they looked at it and said it was swollen lymp nods ,staff wasnt mentioned and the fact the its getting worse instead of better.this was last night today i have no pit because it is swollen so bad and red with fever.cancer is in my family allot my mom,aunt and grandmother died from it.shouldn\'t they have done some test ? and why was she trying to suck out lymp nods like lipo suction. i think she messed up and made it worse what do you think.thank you