Honestly, ya don't need it. Research says caffeine merely gets you back to your pre-caffeine days baseline. People taking in caffeine are then just stuck trying to get back to their original baseline, but it feels like a small rush to them, because deprived of the substance they're lower than usual.
I was drinking 4 or 5 cups a day years ago when I was working late shifts. I tried cold turkey and got bad headaches and felt worse than ever.
But, now years later, I don't need any at all and feel just fine. Just get good sleep. The rest is in your head. It will go away over time. Good nutrition and exercise will help too.