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Hello, you are through to Dr Linda, a UK based vet.
I'm sorry to hear this has happened to Ari and understand your concern.
String can lodge under the base of the tongue, or further along the digestive tract.
The fact he has been sick several times and is continuing to gag is a worry.
It is best he is seen by a vet tonight. They will check for a visible foreign body.
If it has been less than 4 hours, they may induce vomiting to try and get the string back up.