Shiraz is correct when she said cellulitis is not to be taken lightly. When I contracted cellulitis and went to the ER I was immediately put on IV antibiotics. Did they run blood labs? You should probably go back to your primary care physician. She/he knows you personally and should be a bit more concerned, plus they don't have the time/pressure constraints of the ER.

Be assertive! You have to be your own patient advocate!!!