I am so sorry to hear your story. But time IS the best cure. This concussion thing is very hard for a 14-years-old. I completely understand.

You need to stop your activities immediately and have enough rest. Everything you do will only make it worse. In the meantime, look for some other interesting things. Sport is not the only thing you can love. You can always come back to sports when you are fully recovered. You are very young and there is a bright future in front of you.

Take care,