Hi Grandmarob, welcome to the forums! A common cause of headaches, as Skywalker says, is dehydration so if I were you I would check that I was really drinking the 2 – 3 litres of water a day that Michael Mosley says is essential. The other cause – as Skywalker has already said – can be stress! Have you tried the mindfulness techniques that Michael suggests? Your mind will wander and you will need to refocus – but pmshrink says that is normal. Just the doing has a beneficial and calming effect.
I’m quoting Skywalker again here but the fats and low carbs are really important. In the first two weeks I didn’t dare move on to full fat yoghurts ( so brainwashed by all the low fat nonsense) and consequently didn’t feel too good. Full fat Greek yoghurt was a total revelation to me and I now have it most mornings for breakfast – with a sprinkling of ground flax seeds and a few berries.
Professor Taylor says exercise is not necessary when you are on the fast 800 so I really wouldn’t worry about it at the moment. Gentle walking is absolutely adequate and with hip problems I wouldn’t think of anything else until your 8 weeks are over and you get advice from your GP/physio.
Stick with it as you will get results ๐