Could be the liver dumping glucose as mentioned above, and lucozade and biscuits might be over treating the hypo, also mentioned above. So probably just tweak the hypo treatment downwards. I know it's really easy when you're hypo to panic-eat. Try measuring what you eat/drink when hypo (again, I know this is hard to do when you're also feeling hypo!). I try to measure hypo treatment in the form of glucose tablets which are each about 3-4g of carbohydrate. Some like to do the same with jelly babies, but I like them so much, I'd eat too many if I was in a panicky hypo state. I'd rather use the glucose tablets that I don't like much.