What Causes Light Period With Anxiety?

I am very worried, i have always suffered with terrible panic attacks from being a child. My anxiety is non stop 24/7 which has always ruined my life and i will sit many hours checking myself for an illness. I have conviced myself i am dying with cancer, brain tumors, heart attacks etc. But lately i feel a straight tight feeling in my stomach and very bad hot flushes, and my periods seem to be not as heavy as before, Just like a light spotting which is strange i ve never had this before, I m worried it s early menapause i m 22 ! please help as when i m better in the later furture i d love children. thanks :)