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Hello,Thank you for your question.I am Dr Saha, I shall try my best to help you.
I am sorry for your health condition.Both very high & low levels can be dangerous.Cortisone shot can raise the glucose level.When the level exceeds 300 mg/dl you should contact doctor asap.Usually blood sugar more than 400 mg/dl can lead to drowsiness, ketoacidosis, coma.
It should be treated promptly.
I feel you need to go to ER to control the level under medical supervision.
I hope this information helps.If there’s anything else I can do, please let me know.If you are satisfied, please rate my answer as good or excellent.Regards.