I too suffered from the headaches which resulted in me eating breakfast, lunch and dinner on fast days to avoid headaches and ended up consuming up to about 600/700 calories - which although good was not what I wanted from this as it's not exactly fasting is it
and although I was, and continue to, shedding weight - I'm looking for the other health benefits that go with 5:2. I eventually put it down to caffeine withdrawal (but I only drink 3 cups of tea at most a day and no coffee) - I'm now gradually weaning myself on to decaf tea - to be honest I can't taste the difference. This seems to be the answer for me, although of course I appreciate that it could also be my body adapting to fasting - but there's no harm switching to decaf tea for the long term anyway. Goodluck, headaches are so debilitating especially when you have to revert to bed and a darkened room
Hope you find the answer and can overcome it
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