I Was Stung By A Wasp A Week And A

I was stung by a wasp a week and a half ago. Actually I was stung twice. I was fine the first week but then one day the sites were bright red and feverish. This lasted a day. Now a few days later there is still a ring around the injection sites but they look dark. I still have itchiness and the last 2 days I get extremely tired. Do I continue to take the Benadryl or should I see a doctor?