Your friend will be like this until he gets some help to deal with his demons. I had PTSD due to a work related accident and it is irrational in nature. I got therapy and it really helped a lot. It may seem a bit weird, but he has gotten used to his illness. It is like an old friend or addiction. He may want to change, but is afraid of taking the first step. People who have been where he is, Vietnam vets, can help him. There may be chapters of these vets in your area who have received therapy and are able to sit and talk to him. You may be able to find them through the VA, online, or at the local veterans associations. As an empath you will continue to feel his anxiety until he comes to terms with it.
I also suggest that you go to the Home Page and read the "Empath Survival Guide". It helps a lot and will aid you in learning how to turn down the volume on incoming energy. Always know that you can talk freely and openly with us as we know exactly what you experience as an empath. We get it. We live it. You are now amongst thousands of your own kind and will always be treated with kindness, compassion, understanding and, most importantly, LOVE. Welcome HOME.
Throw some love into the wind.
updated by @bing: 12/28/17 11:00:43PM