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This could be an indication of an intestinal obstruction or other blockage that will not allow food to pass. If you suspect this, you should rush to your vet right away.
This could also be a simple case of reflux. You should see the vet tomorrow to find out for sure. If this is the case, your vet can prescribe an antacid that will help a great deal.
Until then, you can use a dose of hairball remedy right before meals. This coats the throat and helps with acid build up.
You will also want to feed the cat several small meals a day and see if it helps. Jarred baby food works well and is mild enough to soothe the stomach. Try to stick to chicken/rice or another bland food with no garlic or onions.
Your vet might want to prescribe tagamet to help with the reflux.
Let me know if you still have questions.