What an amazing story! You have been through much. There are definitely things you can do to help your brain function.
I was in a car accident and have what they call TBI (traumatic brain injury) and have aslo had issues resulting from this.
I have found cayenne tincture to be invaluable. Also, Dr. Schulze has a brain formula that you may want to check out. I have not gotten this yet, but his other products are amazing and I have used them all with success. Ginseng is also amazing for brain function.
Your goal is to increase circulation up there and flush some of the accumulated toxins out.