Lorcet, Lortab and Vicodin are three different brands of the same medicine. They are actually Hydrocodone or Dihydrocodeinone which are a semi synthetic opiod derived from codeine and Thebaine. Actually Mild Nausea, Vomiting, Stomach upset, Fainting etc are common side affects of all these three tablets. And it is pretty normal for users. I would suggest you to consult your doctor for an alternative.