Can you be more specific about the things the concussion specialist did ? What meds did he try ? Are you taking any of them now ?

You should not be pushing through until you are fatigued. It will take forever to recover if you are constantly pushing through.

You would be better to miss school and need to repeat than to struggle through almost failing your classes. A reduced class schedule with tutors would be best. Has anybody suggested requesting an IEP (Individualized Education Program) ? You may qualify. Here is a link to information.
https://www.understood.org/en/school...-and-504-plans