You say "I been sittin here for 3 days"... Rolling over and over in bad thoughts won't get you anywhere. Talk about it to someone close, or to the medical staff. You are not alone going through this. And everyone who's been through it has gotten out. You are human like all of us, so don't be afraid, you are no exception. You will get better, even if it seems too tough or impossible, it isn't. Uncontrolled fear does make one feel weak powerless and numb. I know that when I was deep in, I kept thinking I should write a will, trash all my personal stuff, because I thought I'd go crazy and never come back. But here I am now, calm as a sheep, everything came back together. It always does trust me. Hang in there, take a hot bath, take a walk, go see a sports game, hang with friends, talk about it, even if you're not hungry eat, if the things you used to do don't make any sense to you anymore do em anyway, get good night sleep. And most important if you can put the spot on the tangible things in your life that could stress you up, try to fix em. Try not to give too much importance to the things that can wait. If you have stuff that has to be done, don't be afraid to mess some of it up, the world can wait. Get out in the sun if you can.
This might not be the best advice in the world, but it worked for me: don't sit around staring at your fear, do things you like or used to like, change your mind. When you'll feel better you'll be in better shape to think about all that's bothering you. And talk about it. At first I was ashamed to feel like this, but the more I talked about it the more I realised most people went through this, and it's a normal sign that says maybe there are things that ought to change in your life.
I'm no therapist, I just hope I can help. Just remember, you'll get better. Tough times always end.