Your sugar should be 70-110. Some people can only function between 110-120. Anything below 70 you need to keep an eye on. Defintely don't take insulin if you don't eat.
It is very important that you have 3 meals a day. Carbs -It is important to eat a significant amount. Dr.'s should tell you no more then so many in a meal. But you definitley need carbs. Carbs effect insulin. You may need 60 or so a meal. Ask your dr.
Starch's- starchs will keep your insulin high for about 24 hours or so. Keep starchs low to none.
You defintely need to work closely with your dr. This is not something to mess with because it can effect every part of your body, most importantly your eye sight. DONT FOOL AROUND, PLEASE