Adolescence is a tough time to be recovering from a concussion. The physical and hormonal changes that are occurring make recovery slower. Some symptoms may need more time than others.
As klaus said, you need to rest your brain and you also need to get your brain proper nutrition and supplements, No caffeine or caffeine based energy drinks, plenty of B12 and B6 plus all of the anti-oxidants and Omega 3's. You should also stay away from alcohol. The concussed adolescent brain has no tolerance for alcohol.
An important consideration regarding recovery is your concussion and sub-concussive impacts history. Do you, did you play sports? Soccer, football, LaCrosse, basketball, or any other sports where you may suffer contacts that can jar you head? Even slight jarring like heading the ball in soccer practice can traumatize the brain.
So, rest and take care of your brain and you will recover best.
My best to you.
Mark in Idaho
58 years old, retired due to disability, married 33 years, father of three, grandfather of four, Suffered a serious concussion at 10 years old (1965) stopped most driving after last concussion at 46 years old (2001), Post Concussion Syndrome/Multiple Concussion/Impact Syndrome with PTSD, immediate and short term visual and auditory memory problems, slowed processing speed, visual and auditory processing difficulties, insomnia, absence seizures, OCD, 14 concussions since first concussion at 8 years old, Taking paroxetine for 14 years and gabapentin for 12 years. Added L-Tryptophan and successfully stopped all paroxetine after 3 months of tapering down. I currently take 500 mgs of L-Tryptophan when I wake up, 500 mgs after breakfast with my vitamin regimen and 500 mgs late in the evening.
As of Nov 15th, Due to high stress issues resulting in PTSD, my docs put me on three meds. Clonazepam (Klonopin, a dreaded benzo but only for 30 days ) .125 mgs twice daily (Doc prescribed .25 mgs twice daily but half a tablet is doing good) , citalopram (Celexa), an SSRI , and olanzapine (Zyprexa), an atypical anti-psychotic before bed. I have lost over 30 pounds since mid July. The olanzapine is supposed to help me gain some of it back but it has just stopped the weight loss. They took me off the gabapentin. I am feeling better than I have in years.
I am also taking L-Theanine to help with GABA regulation
"Be Still and Know That I am God" Psalm 46:10