You may Concentrate on two spells at the same time at the risk of overloading your mind. You can cast two concentration spells at the same time as long as they are two different levels of spell. While Concentrating on two spells your mind requires advanced focus and thus can hurt you if you are not entirely in tune with spells. Each turn you concentration on two spells you have a 10% chance of taking 3D6 Psychic damage. (DM rolls a d100 on a 10 or lower you take 3D6 psychic damage)