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In a type 1 diabetic 30 units is a very high dose.
You will definitely require very close monitoring of your blood glucose levels every half hourly and keep some sugar along side you.
If you get symptoms of low blood glucose like sweating, heart palpitations, tremors you should immediately take something sweet like sugar.
Novolog is a very fast acting insulin. Starts acting within minutes and duration of action lasts for three to five hours.
So by the time you receive this message you would have already passed through the stage of hypoglycemia (low blood glucose) if you did experience it.
Let me know if you have more questions.