I have never felt nauseated with low blood sugar, but now i do. what could be wrong?

Depends: If you have diabetes and your low sugar is secondary to too much insulin, nausea when you develop hypoglycemia s not uncommon. If you don't have diabetes and aren't receiving insulin, hypoglycemia doesn't occur except in rare circumstances: end stage cancer, severe liver or kidney disease, prior stomach or intestine surgery, etc. Symptoms may occur as glucose return to normal from higher levels.