hello I am katmae,this may sound off the wall to you but if you have a defuser eather wax or water it dose not matter the kind, if wax melt an unsented wax you can use a tea lite if you take it out of the metle holder and remove the wick when it has melted add three drops of essential oil of rosemary to the wax or water do this in the room you study in this will not only help wiyh the consintraion but it will also help with retintion, you my also try some medatation to try to relrave the stress it should help with your headach(I know my spelling stinks hope you can understand this) and hope it helps I know how it feels to feel alone and hopeless