Giving it up is not the end of the world - It is hard, I sympathise as a Tea and coke lover that hasn't touched a drop in three months.
I recently went and had my first ultra sound, the baby was moving around quite happily, the midwife said. "Oh had it been asleep we would have made you have a cup of coffee, that would wake it". That kinda put me off drinking caffeine again.
It's a stimulant at the end of the day, it's not my place to say that you shouldn't have any at all or how much, you have to make that decision yourself, but we all know it is a stimulant, we take it when we want to wake up and when we have -too much- it gives us shakes and a rapid pulse. I personally like to think tea is a better option than coke as that has other stuff in it and doesn't dehydrate you as well as tea does, but if you can, and is willing, then yeah cut it all out.
If you do cut it out, I found after a week or so I was dealing with it just fine. It was more the association I had with tea and coke that was addictive, like I normally enjoy one while doing house work and that's when I missed it.
Finding alternatives to drink was hard to begin with, like getting used to drinking fruit tea. I began drinking a lot of milk, water, Juice, smoothies and sometimes squash. Having to resort to drinking water and milk is kinda a good thing though.
I began having hot milk, sometimes with a tiny bit of cinnamon in the evening, sometimes with some a bit of raw cocoa for flavouring and it anything it improved my sleep. I was struggling to eat during my first trimester and fruit was the only thing that seemed to go down with ease so I made smoothies and juice when I wanted to treat myself, when queasy I had warm water with a squeeze of lemon/lime.
I am sorry if anything I've said makes you feel guilty, that's not my intention. But I just want to say, giving it up, is not the end of the world, you just have to be a bit inventive with what you replace it with.
I still have a sneaky piece of chocolate now and again though.