Living my life...

I honestly don't know what to think. I tried to lie down tonight, but every time I did I had a panic attack. It felt as though I could not breath and my mind was racing. It would go away as soon asI sat up or stood up. I do know that it felt like I had run a marathon. I am very scared of the feelings. I am so tired. I am going to try to lie donw on the couch.