It’s okay to not stick 100% to your plan, you’re human. Don’t sweat it too much.
If you’re experiencing severe hunger, you may well be at too much of a calorie deficit. In the first week, that was easily masked, but now that you’re low on glycagon, your body is shouting out that something unfamiliar, even scary, is happening.
You could try longer fasts to get your body better used to fasting. You can also try a bit of (more) coffee. You can also try cutting out carbs altogether for a while, so your body gets used to being in ketosis, and stops looking for carbs for a high. Finally more high volume, high fibre foods should help you feel satiated. Experiment a bit, you’re in the early days, find out what works for you.
Personally, I have something healthy (cauliflower rice with egg and chia seeds) on hand just in case I start feeling the binge hunger coming along. A pound of that something contains v few calories, and will stop the hunger in its track.
Keep at it, it’s a lifestyle change, take the time to find what works for you. Good luck!
We all have hard days. I have them after I eat too many carbs at dinner. When I’m in that situation, I try to hold out, but if I’m miserable, I break my fast early and then I start my next fast early. Be kind to yourself. You can do this!