I'm sorry you drank 4tg but congratulations on 20 days. I had sugar cravings too, it is very commonplace and not a big deal as it is not permanent. Trouble sleeping is also very common so it would probably be best if you limited your coffee intake. After about 11am I drink tea which has a much lower caffeine content, it cannot do any harm. I am sure that with a few tweaks to your plan you will be successful.