Fasting glucose=91 & 89 on 2 diff blood test, 2nd time tested insulin 3 hemoglobin a1c 5.4 i am constantly craving sugar, often become shaky & lightheaded, i'm 123 lbs 5'9" am i at risk for diabetes?

No but: Based on your numbers you are not diabetic or prediabetic. However if you consume a lot of sugar and simple carbohydrates and starch. You are at risk of hypoglycemia which seems to be what your symptoms indicate. I suggest eating more protein and more complex carbohydrates which are lower glycemic index and healthy fat like fish and plant-based that. Hopefully this will help get rid of the episodes.

Not right now!: Your fasting glucose, Insulin level and a1c are all perfectly normal - not even borderline for pre-diabetes. Eat regularly, eat healthy food, don't skip meals, don't eat junk food or fast food. Get plenty of fresh fruits and veggies. When you "crave sugar" have a piece of fruit. Stay hydrated and get a little exercise on most days - you'll avoid diabetes if you keep yourself healthy.

Adrenals: Shaking is low sugar your sugar runs slightly above 100 per hba1c 5.0 =100. So you need to bring down stress via supporting adrenals which can be helped via 5 factors - magnesium, b vitamins, water 1/2 of body weight in oz per day, sleep at least 6-8 hours at night, adaptogen like herbs like adhs (vasopressin) from biotics. Take adhs (vasopressin) 2 pills in morning recheck hba1c in 1 month to show progress.