See that while you have holidays that you can change some of your habits.
For instance you can start to replace a few coffes per day with decaf or
green tea instead.
Your body is hooked on caffeine - that means the only way you can get rid
of it is if you slowly reduce your dose and get your body used to a life without it.
Of course you will still suffer from withdrawal symptoms such as headaches, but if you have the free time you can also get a short nap instead of another coffee.
Good luck and ask if you have more questions.