When I am really distressed and upset I get some physical reactions

For me I tend to get light headed, slighty dizzy and ringing in my ears, when its really bad i get stomach cramps after about an hour I am totally exhuasted both mentally and physically.

My Blood pressure is ok had it checked about 9 months ago.

Dont know why my body does this any ideas ?

I would also like to know what other peoples experiences are ?