What are the doctors saying?
Have you had any exams of your neck, specifically your upper neck? It can get injured and cause inflammation that can slow the blood flow through the vertebral arteries. The brain still gets blood from the carotid arteries but not as much in total.
A concussion can also mess up hormones of all types. An under-production of Thyroid hormone can cause weakness/fatigue.
It probably will take some digging by a doctor or two to figure this out. Does your school have an athletic trainer? If so, maybe you can get a referral to a better doctor. Were you playing on the school team or was it just recreational/intramural? Schools usually provide good care for students injured during a school team practice or game.
As you say, this risks getting sent home. Try to not act anxious. It can give them a reason to send you home. If you can show patience and discipline, they will be more likely to give you a chance.
Are you continuing to play basketball? Are you active in social groups? Are the studies challenging?
Please be honest so we can give you valid comments.
My best to you.
Mark in Idaho
60 years old, retired due to disability, married 34 years, father of three, grandfather of four, Suffered a serious concussion at 10 years old (1965) stopped most driving after concussion at 46 years old (2001), Post Concussion Syndrome/Multiple Concussion/Impact Syndrome with PTSD, immediate/short term visual and auditory memory problems, slowed processing speed, visual/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 stopped paroxetine after 3 months of tapering. I currently take 100 mgs of 5-HTP AM, 500 mgs of L-Tryptophan at noon.
As of Nov 15th, Due to high stress issues resulting in PTSD, docs put me on 3 meds. Clonazepam but only for 30 days ) .125 mgs twice daily (Doc presc. .25 mgs 2x daily but half a tablet is good) , citalopram (Celexa), an SSRI , and olanzapine (Zyprexa), an atypical anti-psychotic that usually causes weight gain before bed. I lost over 30 pounds since mid July. It just stopped the weight loss. Took me off the gabapentin.
May 2014, I am off the olanzapine due to a 6 fold price increase. Back on 600 mgs of gabapentin before bed.
Oct 2014, off the Celexa. The 5-HTP is doing much better and leaves me feeling normal as compared to being on an SSRI.
I am also taking L-Theanine to help with GABA regulation
"Be Still and Know That I am God" Psalm 46:10