Redness/Blotches

Hey, I thought I was the only one going through this. For a long time now, when I get nervous, or temps change quickly, or I am embarrassed, my face, neck and almost everywhere get really read and blotchy. It is so embarrasing and the more i think about it, the worse it gets. I dont take any medicine, and I have tried telling my doctor, but i get embarrassed and just leave. I wish i could be normal and not have to worry about when I am going to "break out" Can anyone help?