What Causes Headaches With Vomiting And Weakness?

I m 24 years old n working in KUwait. As a autocad Drafsman n all my work on computer.I m getting headdeck n after dat having vomating so why wats d problem. after d vomating i m feeling a little beat better but next day i m feeling vry weakness in my body lik i dont hav power in my body. So how to cure from ds.