I have exactly the same symptoms (+ anxiety) that happen following periods of time with low amount of food and relatively low amount of insulin (even if the blood glucose is not increasing). Not sure if this is directly caused by ketones build up but every time it happens I have some ketones present. For me, checking ketones during theses times and seeing their moderate/high level helps with reassuring myself that ketones caused it and I can fix it by decreasing them.
Taking insulin, eating equivalent amount of carbohydrates, drinking water and waiting 1-2 hours always works for me when having these states.
After taking insulin and eating I have a habit of taking a shower just to avoid thinking about it. No idea if the shower helps but I tend to feel better afterwards.