Welcome to the forums Groovyjulie
There are a lot of conditions that can cause nausea. Here's an interesting link about when diabetes can cause nausea
People with diabetes may be more likely to experience nausea. Learn about five possible causes for nausea and what you can do to prevent it.
As regards your morning fasting levels, they look pretty good to me.
Fasting, as the name suggests, means refraining from eating of drinking any liquids other than water for eight hours. It is used as a test for diabetes.
Edited to add, is your weight loss intentional?