I to am sorry to hear of your struggles. As Jefferey said, check out the TBI Guide to learn more about your condition It is at www.tbiguide.com
Dealing with serious studies while attempting to recover for a serious concussion is a problem. the over-work the brain receives can make recovery take longer and feel much worse.
Does your school have a disabilities department? Here in the States, students can ask for disability assistance, tutors, note takers, extra time for assignments and tests, and quiet testing environments.
I know your struggles as I had to drop some classes as a result of a concussion during my second semester back in 1974.
Your symptoms sound like you copied them out of a PCS reference. You have all of the common symptoms. Even though every concussion is different, the symptoms are rarely anything but the normal symptoms.
As Jeffrey said, the key is good sleep, low stress and I would add, get good nutrition. No caffeine except maybe one cup of coffee or caffeinated tea in the morning. Do a search on this forum for nutrition or vitamins.
You will find a list of supplements that help the brain clear out the toxins that result from the injury. Only when the brain has cleared out the toxins can it begin to heal. It will likely be slow progress since you did not recover in the first few weeks.
If your struggles get in the way of success with your studies, it might be worth asking for a deferral until the next semester. Or, maybe drop your tougher classes and taker a lighter load until you are doing better.
Relax and rest, anxiety is the worst thing for recovery.
My best to you.