What Causes Inflammation And Sweating On The Skin?

I have had a couple of instances where my skin feels like it's on fire and I sweat profusely. It lasts about 10 or 15 minutes. I get very pale afterwards and so sleepy I can hardly keep my eyes open, just totally exhausted. I'm 58 years old, had a hystorectomy about 25 years ago. Is this normal or is it something I should be concerned over?