As EllieM said it could be reactive hypoglycemia which will need to be checked..but you mention "noodles" give you a big spike..Eating highly processed carb heavy foods will always elicit a big insulin response which in turn shoots your sugars through the roof...I have controlled my diabetes thru eating a keto/low carb diet which has worked well for me,maybe you could try and limit those carb heavy ingredients in your diet and see if that works for you