I used diluted eucalyptus oil to spray on mattress and pillows to remove bed bugs or mites, I do not know if I am allergic to the oil, days later, got bad rash, hives, etc. all over my body and this lasted for over a month. Treated it with anti-histamine pills and diminished the hives. I was treated for urticaria (hives) when I was very young. Now am over 75 years old - did my allergy return? What to do?