Hi there, I have exactly the same several times a day,I dont think its adrenalin but rather a fast rise in blood sugar.I also go very low too, so when I have something to put it up I can feel my sugar rising literally, its like someones given me a Pethidine injection, my hearts racing and my head spins and a weird feeling in the stomach as you said like being on a rollercoaster.It happens to me while running to making me feel drunk as I run.An example, say my glucose is 6mmol before food, it will rise to say 13.8 mmol in half an hour, talk about a head rush!Do you have this often? How long before had you eaten? x