Wow, you are my hero! I would love to be at that level of intensity, but one day I will be
I have read that secret to weight loss is that you have to burn more then you consume, but you have to be concious of the food your body needs as fuel in order to run efficiently.
I am not sure what diet you are following, but you may want to compensate by adding in more lean protein or veggies. Otherwise you could begin getting light headed and dizziness.
Good luck and I am curious what others have to say on this topic as well.