Hi There,
We all go through the process of grieving what we've lost. It's a different process for everyone. Knowing intellectually that you should accept what has happened and being able to accept it emotionally are two different animals.
It took me well over two years to finally accept that I was limited and 3.5 years later I still have moments of grief or anger at the loss. And I'm still improving significantly due to some treatment I'm receiving for pituitary dysfunction that was caused by the concussion I sustained.
Remember that you are human and you are going through a rough time (which is really putting it lightly). I think most importantly you should be gentle and patient with yourself and understand that this process can be very difficult.
You're not a downer. Your post is not a downer. You have to be honest about your experience and your experience might not be what "the average person in America wants to hear" but we are not average.

Many of us have been through pure hell and we get it.