Wow, I got chills when I read your post, because although I'm on the other side of the scales of life (54, and heading towards the end of my professional life) I could have written exactly the same thing about my physical, mental and emotional state, and even the part about the messy house and unwalked dogs.
I have to commend you for graduating! That is amazing! It reveals so much about your character and toughness. It also reveals how much energy (that you somehow generated) you spent on getting yourself where you are today. You should be exhausted because you had a goal and you accomplished it against all odds. You had to shove aside your own personal reality (physical and cognitive weakness) in order to accomplish your goal and now that you did it, you have the time to accept how hard your new condition makes your life, and maybe you even grieve how easy life was before you had the surgery. I know I do.
It's almost impossible what you accomplished, but you did it and as someone who can relate with your physical and cognitive state I know you must have discovered some sort of super-power. I send you my most heartfelt congratulations.
Are you doing any vestibular and/or occupational therapy? You probably didn't have time but now that you're graduated, maybe you can make time for it before your graduate studies. I have read plenty of posts that demonstrate the success of these therapies. I'm getting extensive balance testing done in early March and they will be designing specific therapies for the damaged parts of my brain/nerves.
Also, I often think I'm depressed, but it's actually anxiety: The way you describe running in front of the truck is very familiar. A VA doctor diagnosed me with PTSD years ago and I took part in a two year study that included medication and regular talk therapy. I hated it, but after about a year and a half, my life changed and I experienced life without constant anxiety. There have been many, many ways my life has changed for the better. After the two years I didn't feel the need for medication and I stopped taking it. I was fine until after my Translab surgery. Now after seven months post-op, I realize that I need my anti-anxiety medications to handle my "depression." Because of my past experience, I am not fighting taking the medications because I know it will be temporary, it will work, and it doesn't change who I am.
There are times when I think something is wrong with me because I'm not doing better post-surgery and I often read other posts where people are doing much better. I have even wondered if I'm somehow causing this dizziness and foggy brain and head pressure, etc., etc. myself. It's because I've always fought whatever challenges I've faced, but this one is winning and I don't know how to deal with it. That's the source of my anxiety.
I am grateful for your honest posts because it reminds me that I'm not alone feeling like I do. I want you to get better and I want to get better. Hopefully vestibular therapy, medication and time will make a difference and life will get a bit easier.
I wish you the best of luck and patience.