I felt exactly like that from 5 weeks until 12 weeks... If I wasn't at work, I was in my bed. And I spent all day at work trying to stay awake, trying not to throw up, and just counting down the hours until I could get home and get back in to bed. Felt like I was just permanently ill and didn't think it would ever end. My husband told me afterwards when I got back to normal that he felt like he hadn't seen me in two months as I'd just been asleep the entire time I wasn't at work! I don't feel completely better now at 15 weeks, but I do feel like a completely different person to how I was up until 12 weeks! It's hard to describe what that first trimester is like to someone who hasn't experienced I think... it's the worst sickness I've ever felt, I think it's mostly because it just goes on for so long and you have to get on with normal life through it somehow. Really put my off wanting to have another child!