I lived for the best part of a year with an allergy no doctor could explain, a skin crawling and sometimes pins and needle itch you would not believe. I went everywhere to find the problem, I was told to just accept it and get on with life. I was taking antihistamines which made me drowsy and apathetic.
I had lived away from home for years and the trouble started soon after moving back. My mother was putting EQUAL (an artificial sweetener) in my tea. My father had some put in his tea by accident and he got the symptoms.
It took me a few days without Aspartame and antihistamines but the problem slowly went away. FREE AT LAST.