Always Tired, Headache, Difficulty Breathing, Tearing. Help

I have never felt this before but period of four years right now I am always tire even if i get enough sleep,head throb sometimes i feel like someone is beating my head with a stick, I cant focus on the tasks that am doing at the moment, cant focus on my studies, sometimes if want to study for a test or quiz i will just stop and do something else. I have also hard time of breathing and it will take me moments to breathe. I will get confuse so easy, during at night when i go to bed before i fall sleep tears will come down from my eyes and i dont why, will just cry for nothing. Doctor please help me all this symtoms are effecting myself, studies, and my future! thanks!