I am so sorry to read this. I was a govt contractor and saw many of my strong young friends deploy and come back wasted and sick even from the training camp where they get ready and get the shots. It's a well known misery.

If you have not already - try fb groups for vets regarding natural treatment for chemicals. There are some in there trying to detox the stuff out. Some of the stuff is actually not that hard to get rid of, and some is really hard or impossible. My prayers for your son's recovery and strength. He's lucky to have you.