Need help quitting coke

Sooo I’m 19 weeks my biggest craving is Coca Cola I cant fight it, I drink it way too much, I’ve only had one glass today which is a triumph compared to how much I was drinking it, I had to give in and have one glass because the caffeine withdrawals are horrible, my head was pounding so badly. I’m so agitated, I just want to stop drinking it, it’s no good for me and definitely not for my growing son. I just need some suggestions on how to get through this without murdering someone or crying from my headache, I’ve drank 2L of water today also not helping this headache at all, only a glass of coke did 😔