There is always hope. Hang on to that. People on this site who have TBI can and do get better with time. I know it is hard, I have read posts like yours for years now. Stay here and get the support from those who suffer from the same thing you do. Take it one day, one hour, one minute at a time.
Will you doctors do nothing for you to help out? There are therapies available if your doctor is knowledgeable. If your doctor just brushes you off, search for another. Often people on this site can give references to doctors they see in your area.
At my darkest times, I picked just one thing a day, that made me happy. A poem, a song, a sunset, birds flying over. Anything I could to distract myself. It does work. I will keep you in my thoughts and prayers. Post to Mark of Idaho. He is very educated about TBI, and suffers as you do. ginnie