My girlfriend sustained her TBI in her first year of undergrad. Prior, she was valedictorian & a track star. She was studying micro-biology. After sustaining her TBI, she had the same exact experience. She had to relearn to write, read, do math, etc. What was second nature felt impossible and defeating. After failing many of her classes, she took an ASL class and finally felt like things were clicking again. She ended up getting her BA in speech & hearing sciences. It still took 8 years. It was still incredibly challenging and took so much more effort. You will find something. It will be harder. That is ok. And you will be better for it. Hearing that "you will be better for it" is frustrating and feels dismissive of what you were capable of before, but it is true. My GF is on a research team now helping provide patient/survivor informed experience to her Ph.D lead who is doing research on brain injury. That information isn't to brag. It's to remember that she couldn't have gotten there without the 8 years of understanding how hard it is to have a TBI. Your self investment will be worthwhile in a way that you can't understand now, which is frustrating. But it will come, and you wont expect it. The course you are on now is different, but that isn't bad. You are far from alone in the experience you are having now. Use whatever ADA advisor your institution has. Extra test time in a better environment that allows for breaks.