Hello,i Am 25 Years Old Female,healthy. I Dont Have Any

Hello,i am 25 years old female,healthy. I dont have any medical problem. From past few months,i am experincing some changes in me. In this past summer,i felt too hot than others n i sweat more lot than i used to. In winters,i have this problem going on for years now..my feet espically fingers become itchy when it get hot. I keep scratching my foot n it gets red bumps where i scratch.so i try keep my feet cold but it happens even,the redness n bumps,pox like. In past few days,i think it expanded,i feel d same thing in my hand fingers n on my face. My face is constantly burning . From neck to head,i feel too hot to bear. Red bumps are appearing on face now n little itchy skin. But the constant burning sensation makes me panic.I dont feel too cold.I am irritated all the tym now. What is wrong?? How can i make this constant burning sensation stop??