Did you read "The Solo Partner" by Phil Deluca yet?
It talks about how we react to our spouse (and other people, too). You have a response to just reading his emails. Recognize that the communication with him is causing it. Do something to calm down, deep breath, walk, what it takes. Recognize it each time it happens and you will be able to deal with it better. Try to take control of it.
Don't let your reptile brain be in charge. If you read the book you will understand!
I am sending you a warm Hawaiin breeze, scented with night blooming jasmine. Hope it gives you a little lift and calm!
Aloha,
Wendy
Me 57 XH 58 Sons age 32 & 27 M:32 D final 9/12 Bought 10 Acres and Living the Dream!