What Causes Constant Headache?

hello . i m 25 female . got married in 2007 and have 3 kids . . i m suffering headache problem , i also feel current in my head often its too much irritating n having headache almost every second day . the pain is some time severe during this my heartbeat became fast , vomiting, one sided headache . please tell me if i have a serious problem or should i have to start any treatment????