last 2 flushes had vomiting in the morning

The last 2 times I have flushed I have vomited the olive oil and grapefruit juice in the morning. Is this normal? How do I prevent this? I didnt do an enema before because I already felt so dehydrated. I had been doing a 4 day fast and felt it would be too much. Needless to say, I have learned a LOT about how NOT to do things on my 7th flush!