Advice for Hard Dry Cuticles?

I know there are good tips here. However, you might consider whether simple dehydration is contributing to or causing your problem.
Our bodies are 75% or so water. That means we need a lot of water intake to maintain good hydration. You might try keeping a short-term "water journal." Jot down how much water you drink on any given day, or keep track for a week, whatever works for you. If you're drinking less than, say, a quart of water a day, you probably need more.

That's only a guess, everyone is different. One surefire signal of dehydration is a headache. Try drinking a glass of water. If it helps, dehydration was what gave you the headache.
Try keeping a glass of water (preferably filtered,) or a reusable bottle full of water on hand all the time. Yes, it'll mean you'll make more trips to the bathroom - but you'll probably start noticing less dryness in your cuticles.
Hope I've been some help...