Didn't make it; and a ketosis question

So after about 24hrs I started to tell myself that now isn't a great time to do this as I have holidays in a month and the chances of eating unideal food then are high. Besides if I fasted for a month then that would be an awful time to refeed.

Also I was thinking of going just for a week for the experience, but if I understand correctly that would slow the metabolism and you would still need to eat carefully for a month or so afterward; again cutting into my holiday.

My apologies for posting before fully planning this out. I will be back again in a month or so for round 2.

Unless someone has good reason for me to do a short 7 day fast now otherwise I will just continue intermittent fasting.

Oh I've a question about that if you don't mind. After only fasting for 24hrs I seem to break into headaches. I thought this was a sign of ketosis which I know happens after 72hrs. Could the intermittent fasting I've been doing be allowing my body to convert to ketosis earlier than most?