Champagne I would definitely speak to the doctor. I'm feeling similar to you but luckily haven't been actually sick quite as often (I've been wearing the sea bands - don't know if they help or not but I'm not taken em off just incase).
I had a telephone app with my doc the other day and she was so supportive and told me to stay at home and rest as I shouldn't be working if I feel this bad.
I know it's hard to be off work, I always feel guilty and like I'm letting people down, but if you're ill, you're ill! Okay it's caused by pregnancy but that's all the more reason to take some time to rest if that is what your body is telling you do to.
I've also started acupuncture to see if that helps as a lot of people say it can really help in pregnancy. I usually have it to help with other things and swear by it, so am hoping it can help me feel better. It might be worth giving it a go if there is a practitioner in your area.
I really hope you start feeling better soon. It's horrible feeling this bad. We just need to try and stay positive and remember it means there are lots of hormones whizzing around looking after baby. Hopefully by 12 weeks well all be blooming!
Good luck and definitely see your GP to see how they can help xxx