I've had many concussion but my most recent November 15' and that one was vestibular. It took me down a dark rabbit hole for a while with a lot of the same things you have mentioned. My anxiety was off the charts, my resting heart rate was over 100 for about 3 months. My vision and balance were awful. The first thing I want to ask, has someone done the Epply maneuver on you? I'm sure they have but if not that helps with a lot of the dizziness. I also was put on a low sugar, low carb, and gluten free diet. Its what most neurologist recommend for a healthy brain. I did my pt work and eye and balance exercises. About 4 months after I started feeling a lot better. I made it back to being my normal self with just some ringing in my ears. Other than the PT I don't know what else really helps other than time. I tried all the other stuff with no real results. Good luck to you!!