Thank you for your question.
I am Dr Saha, I shall try my best to help you.
As you are having diarrhea, there can loss of fluid, malabsorption.
This can cause dizzy feeling.
As you can not keep up the level with oral glucose, drink, you will likely need IV.
I would suggest to go back to hospital.
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.