First and foremost - thank you for serving our country!
I am proud of you for getting help. Even if it is confusing right now, I think bebop is right. If they ask questions incessantly, you can reply I don't have the words for that right now and I'm getting help. That is the truth. As you feel more comfortable you can share more, but if you just let them know you are struggling with some things right now, I think they will understand! I am sorry you are in so much pain! I wish I had some great words to say, just know that we all support you and are proud of you!