I've been thinking of going on a caffeine detox

I drink an average of two energy drinks and a one litre bottle of pop each day, just to feel normal. The pop I usually drink is Pepsi zero which has twice the caffeine as normal Pepsi. I need to drink those to feel normal throughout the day, otherwise I feel anxious and tired. 

I thought of weaning myself off the caffeine for awhile and not drinking any caffeine for a month or two(to detox and lower my tolerance to caffeine) and switching to green tea, as it's only natural all of this is affecting my sleep and my concentration in general. Green tea has less caffeine and in general it's a lot healthier for you. 

Not sure how Id wean myself off the caffeinated beverages. Though I think it's a good idea.