Constant Irritation in my head. Advice!

My brain feels like its burning, dry! Now its like as though its tearing from the inside. In a day when I do thing normally like go to college I feel fine and I have no problems concentrating but when I try to be idle in my thoughts or tend to relax my head its just impossible! I never get good sleep at night, its hard to sleep.. I fall asleep after 3-4 hours of telling my self that its alright I can sleep! I tend to sleep good during the day but before my wake up there is a sudden acceleration of my heart.. like it rapid beats me to wake up! This sensation in my head is making me take deeper breaths.. I've tried deep breathing exercises but it only eases my mind for few hours and then its back again. I'm in this situation since two months. PLEASE ADVICE!