Just spent the last hour or so letting my Meg in and out of the patio door.  She had her food and then some left over spaghetti - only about a tablespoonfull.  She was restless asking to go out and then back in again until she finally vomited.  She then went on eating grass frantically and all the time having vomiting actions like violent hiccups.  She got soaked outside and came back in to cuddle up against me!  Started 'hiccuping' again and went out to eat grass and vomit. She did this half a dozen times.   She did manage to re-eat all her food again (charming) but I called her in before she did it for the third or perhaps fourth time!  Her gut spasms seem to have calmed down thank goodness - it is really pouring down now.  She has had this sort of hiccups thing before but not so violently.   It is a mystery why it happened.