Kay03, this sounds awful. But I want to tell you that it will be ok. Here's why:
Firstly - the hormones and the tiredness ARE making a huge difference. Your hormones are making you feel things that seem like they are real, but are just your hormones raging out of control. Then you are finding it difficult to sleep, and that is making it worse. No doubt, the general feelings of lack of control in a new pregnancy are exacerbated by you feeling out of control of your emotions. But they are your emotions, not you. Please try to be kind to yourself - take a break, go to bed early, try to take your mind off things.
Secondly - it will pass. The only reason I know this is because it happened to me. Two weeks ago I was exactly in the same place as you. I had even thought of killing myself, and just didn't know how things would ever get better. Like you, the pg was planned, so I was ashamed to have all those feelings and didn't think my DH could understand. Then things just got better. Strangely, a crisis in another part of my life made me able to put this in perspective, and realise that whatever happens, this is an experience that I'm living now, not in 5 or 50 years time. There really is no point worrying about the things that might happen in the future - all you can do is go with what is happening right now, and try to relax into it.
I know that this might not seem particularly realistic to you, but please remember that it WILL get better. It really, really will. The hormones will change, and the rest of your pregnancy will not be like this.
Thirdly - there is help out there. Please make an appointment with your GP and tell him/ her that you have been suffering from anxiety, and that you have in the past as well. Your GP will be able to refer you to counselling and other kinds of advice.
It's completely normal to feel panicky and scared, so don't think there is anything wrong with you. But do concentrate on making yourself feel better.
Good luck.