Like Mark, it's taking me time to work through your post.

I echo the suggestion of a neuro-psychological test. It really is the best way to access how your brain in working and how that is impacting your day to day functioning. Once your issues/deficits have been identified, therapies can be targeted accordingly.

Just from the symptoms you've described, you sound like a candidate for intervention to help you with PTSD. Attention processing therapy might also help you improve your focus and get those racing thoughts under control.

The point is, once your neuro-psych identifies your problems, there are medications, therapies and adaptations that can improve your life. Knowledge is power.