Having been off cigarettes for four days, you have already been through the worst and things can only get better from here. Just have patience and faith in yourself. The nausea
will be gone in a few days. Also keep in mind that the medications you are on, also can cause nausea. Try to combat the craving by either eating/drinking something or by distracting yourself. Always remember that craving is intense but short-lived, like waves in the sea. So if you can resist it for a few minutes, it will go away. Craving will also diminish in the next few days. If you still find it difficult, you can consider medications other than the nicorette
inhaler you are taking, and discuss the possible options with your doctor. Bupropion
would be a good option in my opinion, to control your craving.
Hope this has been of help. Best wishes.