The 20-year-old star was treated for dehydration in New York after picking up the stomach bug on his way there last week.
He had flown out to support the Trevor Project, a suicide prevention charity for gay and transgender youth.
Daniel jetted back to London yesterday and one passenger said: "He looked as white as a sheet.
"He said he felt like he was going to die and had spent most of his time on the toilet."
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Get well Dan!!
