i feel exactly the same everyday, sometimes i can't drive or be in air conditioning etc. in fact, a few weeks ago, i was rushed to hospital in an ambulance after collapsing in a shopping centre (very embarrassing). anyway, it turned out that my bloody sugar level was very low, and my blood pressure is a bit spasmodic. basically, my ob just tells me to rest, not let myself get hungry etc. i wouldn't worry too much, i've been like this since about 7 weeks, and baby is very healthy