Always tired

I'm so sick of always being so tired the last few years. it doesn't matter how much sleep I get I wake up just exhausted .I have to drink energy drinks just to feel halfway normal. I did go and get some blood work done a year ago and everything came back normal but I don't understand why I'm so exhausted all the time. I do work outside the home full-time and have three kids. I don't even tell anyone anymore how tired I am because I'm so sick of them saying you're too young to be this tired all the time but why? I'm human too. I'm not old but I don't think I'm too awfully young either 36 years old. I have a two year old who still doesn't sleep through the night I have to get up at least three or four times with him. My husband works nights so when I get off of work all the responsibility is on me. I do take vitamins thinking that may help but it hasn't helped me yet I've been taking them for a few months. does anyone have any suggestions on how I can stop feeling like this all the time!!