Gabe, Some therapists push too much therapy too soon. That can be taxing on the system. Have you had any blood work done? Thyroid and hormones plus B-12, folate, magnesium, D-3, and more are all worth checking.

The common drug for concussion headaches and insomnia is low dose amitriptyline or nortriptyline before bed.

Do you rest or nap during the day? Many think this is good but it is not. You should try to sleep at normal times so your sleep cycle functions properly. A few minutes of eye rest during the day is OK.

As Jo*mar said, your neck is an important issue with a concussion. A subtle neck injury can make concussion symptoms worse or even be the trigger for those symptoms.