Your symptoms do remind me a bit of autistic burnout. The weird headache in particular- it almost feels like a speciifc piece of the brain is a very tired muscle that is cramping or something, much different from a aregukar headache.

My uneducated rule of thumb is that GAD usually involves feeling anxious without any apparent cause. The people I know with it say that they sometimes just feel anxious and don’t know why. Just a bad day. So it is possible.

Anxiety needs to occur frequently for a long period of time, usually 6 months, to get diagnosed as GAD.