I Am Having Trouble Staying Awake During The Day. No

Question: I am having trouble staying awake during the day. No matter how much sleep I get at night I still have problems staying awake during the day. It mainly occurs when I sit down and start to read or write or when I start to drive my car. At first I get this feeling like a floating sensation and I start getting this weird like feeling that makes my vision blur and my head start feeling funny and I shake my head like I'm trying to clear up whatever's going on and it may work for the first few times and then like right now while I'm trying to type this message I've got that funny feeling coming over me add to where I feel like falling asleep but it makes my body feel weird and if I try to walk I will almost fall out and my arms and legs start feeling heavy and if I try to speak my speech is slurred and I begin talking out if my head one minute and then it's like snapping ur fingers and poof I'm back with u. My husband even says I get like this look in my eyes like u know the lights r on but no one's home kind of look where they get real glossy and weak looking. My whole body will start to feel numb and my arms and legs feel too heavy to lift. Please help me I don't know what is wrong this comes on suddenly and I'm truly scared!!!