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Thanks for your question.
I understand that this answer is late in coming.Somehow this question did not appear in medical question till now and I am answering it as soon as it appeared in my list.
If you are unable to keep down food you are in danger of getting dehydrated and developing electrolyte imbalance especially if you had been in hospital for similar issues.
It would be safer to get back in so that you can be assessed and treated accordingly.