This could also be Asperger’s/high-functioning-autism meltdown. A large percentage of people with Asperger’s have co-morbid ADD, plus you mentioned anxiety, which is also mentioned here: https://www.autism.org.uk/about/behaviour/meltdowns.aspx
This could also be Asperger’s/high-functioning-autism meltdown. A large percentage of people with Asperger’s have co-morbid ADD, plus you mentioned anxiety, which is also mentioned here: https://www.autism.org.uk/about/behaviour/meltdowns.aspx