It sounds as if you have high histamine levels. This means you are reacting allergically to something. It could be food, supplements, fumes or chemicals. I usually react allergically whenever I visit furniture stores or stores with lots of plastic things, especially if ventilation is poor. My face goes red, I get hot flushes and my heart beat rises. Research finally explained why I get bad reactions to Folic Acid and vitamin B12, they both raise histamine levels. Quercetin and vitamin C (the non citrus kind of course) apparently lowers histamine. So does the amino methionine.

I've recently found that soya increases my histamine levels big time. I get face flushing, spots, anxiety and brain fog.

Food that is known to trigger histamine are; chocolate, pork, citrus. strawberries, vinegar, tomatoes........
http://users.bigpond.net.au/allergydietitian/fi/amines.html

Also candida can cause high histamine levels: