I am also a vet who is a counselor for the Vets Center not associated with the VA. I have called the Vets Hotline many times since I have PTSD myself. They will take care of you no matter what your status is with them. They have gotten better at this.
Remember you can go to a hospital emergency room and they must take care of you if you are really in a crisis.
If they feel you are in danger of hurting yourself then they may take you in for 72 hours (depending on where you are) until things are a bit more squared away. I know many vets who were "inpatiented" and it was difficult but they are better. They were not "committed" to a mental institution.
Some quick techniques for you. Don't let your mind roll to the past. We who have PTSD tend to remain fixated there, with what we saw and felt. And we are in a kind of circular zone where our mind tries to keep resolving something that often cannot be resolved.
Siop a moment and start breathing through your belly, not your chest. If your shoulders raise while you breath, you are just putting more carbon dioxide into your brain. It needs more oxygen. Make your belly button go out as you breath in slowly with counts up to 5. Then breath out counting down to 5. Empty your mind. You will immediately feel a sense of calm and your mind will clear. Anger is one of the things we with PTSD have to recognize and let go. It turns inward. We have to let go of anger. It is the path to recovery.
PM me if you want. I will give you a Skype number and we can talk. Meanwhile, do not underestimate the VA. They have guys that have been there too. Trace14 is absolutely right about the steps to take.
Stay in the fight. There are forums to go to that have lots of combat vets there and they are more than happy to help you.

Charlie Mike.