I had a very bad reaction after having 3 stings on my right wrist in Sept. 2016. Wife made a 999 call and I was taken (eventually) to A&E...within 10mins of stings I had a severe rash on both forearms and chest, but only a slight prob with breathing.. .. Had a follow up appointment today in Allergy clinic....had interesting conversation with the consultant..long story, but they are sure the severe allergic reaction was caused by the side effects of two of the meds I have to take...Bisoprolol for heart problem, which they cant replace (the tablet ....not the heart) ,and Lansoprazole, a antacid/protein pump inhibitor.... they have changed this to Ranitidine..... 7 days after the "bad" sting I had another sting only 2cm from the other sting with only a slight reaction and minimal swelling.