Hypoglycemic diet side effects

My Grandfather and I have terrible problems with needing sugar to control how we feel - I did some research online and hypoglycemia seemed to explain everything. There is a family history on his side of type-2 and his brother and sister both have the same symptoms as us. All four of us have been doing the same thing for years thinking it was acceptable - controlling our daily 'episodes' by scoffing raw sugar and a needing a very sugary diet to feel well between the crashes. After reading several books on hypoglycemia I realised my diet needed to change immediately and began the full hypoglycemic diet.

Two days in and today I feel really really awful. My thoughts are drifting, I can't speak without either forgetting words or saying the wrong one, my vision is swirling with colours and I generally feel like my heads spinning. Feel fine physically although my cheeks are burning hot but temperature normal on testing.

Eating normally, had seeded brown toast, Special K cereal, chicken soup and chopped apples so far today. Only difference is i'm not eating huge amounts of sugar and biscuits to contol my wobble symptoms - through the night and this morning I would have easily eaten a packet of chocolate digestives by now! Only other noticable difference is ravenous all the time.

Is this normal for the first few days of the diet? I've read several places you feel worse for a while but didn't expect all this to be honest.

EDIT: Tonight I had the worst 'attack' i've ever had. I began feeling like I had the flu around 2 hours after eating my vegetable and fish dinner. I began violently shaking, went yellow and my pupils were huge. Immediately recognised I was having serious problems and ate a teaspoon of sugar. By this time I couldn't string a sentance together and started crying my eyes out for no reason whatsoever - violent crying, it was the strangest thing. Several minutes later I went completely back to normal - better than normal actually as my head didnt feel foggy like it had all day. Had a cookie and sipped at hot tea until I felt able to eat and had chopped banana and mixed nuts with yoghurt. 80 minutes later I started feeling fluey and confused again. I really am having a hard time with this, i've eaten more food today and through the night last night than I do usually as im ravenous all the time but still having what seems to be huge sugar crashes every few hours. For now i'm easing up on the diet until I get some medical advice. Any insight though about whats happening would be greatly appreciated. Can I assume this violent physical reaction to 48 hours of the diet confirms my dependancy on sugar or is it something else?