That's a massive single paragraph to wade through.
I'm unsure what you are asking. I'm sure that the misdiagnosis, if that's what it was, was not malicious, made as what was considered most likely. I know in the States that they sue for anything that they can think of, but it'd seem inappropriate to me.
You have to move forward from where you find yourself now. Kerp up with the diet. And decide what you wish to do with your life. It need not be the military, but that is one option open to you. Or you could work and educate yourself as a civilian. Your life, your choice.