It's funny about PTSD, no one in my family knows that several of my friends and I suffer with it. We are all Cold War vets and never had direct contact with enemy forces. My DGD without knowing what she is doing, senses when I am having a panic episode and tries to comfort me and get me to relax. She has been doing this for about five years now. My cat used to do that too. It may not be much help to you but all of us that have suffered through it, have found that peace and quiet sure helps calming the fears and panic.
Good luck and easing into longer and longer times away from home may just give you the ability not to panic and require being druged.