Hi and welcome Rotaman
I know exactly where you are coming from - Even Mr Big isn't big enough - they should introduce a Mr Bigger
If you are getting hunger pains and headaches you may need to tweak the dietary plan - they are something you don't have to put up with, you've probably heard about it before, but you don't want your body to go into starvation mode or for any weight loss to be drawn from your muscle mass. Make sure you get plenty of fluids and try to make sure to get protein in diet as frequently as possible.
Hang in there, you will feel heaps better about yourself when you have dropped 10kg or so, it gives you momentum, and the kgs seem to drop off.