What Causes Headache With Blurred Vision And Nausea?

Hi i have been getting these veryy bad heads there like someone is hitting me in the head with a hammer i sometime get them when i wake up from a nap i wear glasses becus my vision was getting bad up close i get dizzy and feel like i wanna throw up but cant i wake up in the middle o the night just looking around dont know what im doing whats wrong with me