Extreme nausea!

HELP! I have had extreme nausea the entire day for about a week. I'm so exhausted! No appetite and when I do eat I gag or dry heave for an hour afterwards. I have tried ginger teas and candies, peppermint, eating small meals, eating larger meals, sea bands, Popsicles and I just can't find what works! What am I missing?! I'm desperate! Can't do anything, missed work most of the week and now my 10 year old god daughter is here for vacation and I'm basically bed ridden! Any and all help and advice is appreciated!