17year old male on insulin for several years but occasionally he goes through a bout of vomiting clear liquid. Sometimes for 3-4 days but only once a day mostly early mornings. I make sure he has wet food all night long so he won't have an empty stomach but of course that's up to him. In the past I've checked his glucose level right after and found no indication of very high or very low. He does have some dementia (my diagnosis) and wonder if that may be the culprit or maybe anxiety associated with his age and medical conditions. Anyone ever deal with such or have input for us?