Here are some links. You can see that there are several MIs possible after a brain injury, but Aspergers is not one of them. You can also have a look at the kind of tests they do to check, and ask your doctor for them. Good luck!

https://www.ncbi.nlm.nih.gov/pmc/art...6/#!po=37.3239
https://www.scientificamerican.com/a...ental-illness/
Emotional Problems After Traumatic Brain Injury
http://www.bcmj.org/article/mild-tra...iatric-illness
Psychosis following head injury: a critical review | Journal of Neurology, Neurosurgery & Psychiatry