Third of all: Hyperactivity causes you to disturb classmates and the people around you. This is the same for stimming in ASD. That means you have the necessity to mask. Masking is very harmful in ASD. It takes a lot of EF and in the best case will cause dissociation, in the worst case it can drain

Ur EF so much that your brain no longer has the energy to maintain other functions (things related to skills) which then cause autistic burnout aka you literally forget how to do skills you had learnt. This can go from talking, walking, reading to very niche things.