Dizziness

Hi, I’m only 4 weeks and 2 days pregnant and the last couple of mornings I’ve been waking at 4am extremely hungry! I’ve noticed today that if I don’t eat at that time and I go back to sleep, I wake again extremely lightheaded and dizzy and the room seems to be spinning! Is this normal? I’m now in bed trying to rest only I can’t move my head at all otherwise I get dizzy again.