Congratulations chap. Be prepared for some seriously depressing times ahead, but don't let those moments get you down. Doubt may creep in when you struggle for the next & the next, but keep your head down, keep working hard, keep doing what you're doing and whenever you feel like it was just a one-off read some of the inspirational threads on here - it will remind you again that you're now officially on the right path and why.
One of the most important things you can do right now is make sure you have EVERY SINGLE THING tracked to fuck. Use this moment in time to go over your tracking and make sure it's all in place - the moment you spot a downward direction in your figures and graphs you are armed and ready to do something about it before it goes further than one or two steps. Equally - the moment you see its upward trend you are equipped with the necessary tools to see EXACTLY why it has worked and can apply it in other places (if it's relevant).
Good luck chap - it's a great feeling isn't it. Repeat & Scale up.