Hi there ~
can manifest in many ways. The technical term for the same is anxiety
. Chest pain
that is frequent in nature and not attributable to any cardiac disease, shortness of breath
and other symptoms are classic of stress and anxiety. Usually they are accompanied by difficulties with appetite as well as sleep abnormalities. Will all the travel that you have been undergoing due to your military service, I would recommend that you see a psychiatrist
as soon as you can to get help with medications. I hope this helps.
Take care and have a nice day !