I'd like to join Tim and Checkers in greeting you. I think you have done exactly the right thing is coming here and yes, you will certainly get other's opinions, unfortunately I'm not sure many will be of comfort.
I'll start by saying I believe a realtionship involves trust, reliability, care and concern, a genuine and deep desire to look after the other partner. Mutual support and to enjoy being in their company. Being intimate is important too, it shows closeness, tenderness and mutual pleasure. Simply having fun with the other is also part of the mix. These exist, I am blessed and know.
Your account works its way though each of these points and highlights their absence. From your account he simply does not care, his interests lie elsewhere. He is dishonest and tries to put the blame on you. Add to that PTSD and anxiety and you are facing a terible life.
Of course you think about it all the time - your world has unraveled, and feeling sick, crying and losing weight are all signs of how bad things have got.
I guess it may be time to step back and really look at the relationship you are in, and how far that is from the loving one you need and expect (as you should).
You may think things will improve, well perhaps, though that normally starts with the partner who is in the wrong trying (consistently and hard) to make amends. You cannot hold it together for both of you, that takes both persons.
You may think things will remain the same and you can bear it, however your reactions, both mental and physical do not seem to bear this out.
I can't suggest what you do, other than ringing Relationships Australia - 1300 364 277 for an outside perspective from professionals that deal with this sort of behavior all the time and can let you know what practical options are available to you.
Some people might say leave. Sounds good but as so many have found it is not that simple. Kids, finances, practicalities, the end of hope are just some reasons why people stay. Others do leave, it is hard either way.
So what support is there for you now? You do need it even if you think it will make you feel a fool (quite unjustified) and gets him judged -as he should be! Your brother or another family member perhaps? Someone to speak frankly with and get their care and help. You do need an ally. This is apart from the medical support and therapy which is so important too.
I guess there is more for all of us to talk about, if you would like to come back?