Like mentioned, drink a shit ton of water, and expect to gain water weight. And know that it is true water weight, depending on your size maybe as much as 10 lbs.
What it is for really is an aid in strength training. You wont get much if anything out of it doing endurance work. You will do more weight in your lifts, or more reps. IIR its more about pure strength and explosiveness.
So you can use it for a while to gain some strength. Then when you're off of it for a week, see how much of the gains you retain. Do your research first. Ive used it on and off since the early 90s. I prefer now not to use it but thats just bc im old.
How do you figure 10 pounds? You should retain a bit of water, but I don't see 10 pounds worth honestly. I don't know how many H20 molecules are needed to bind to a creatine monohydrate (the name suggests just 1 water molecule per creatine molecule). I would assume you'd only gain as much water weight as creatine you ingest, which should not be more than 2.5-5g per day.
Additionally, being off creatine for 1 week shouldn't do anything to do if you've been on it for more than one month. Creatine works by saturation of your cells. Therefore, it takes a while to actually work, and a while to stop working. You won't see the full results of creatine use until 30 days of constant use (taking 5 or so grams a day).
Lastly, creatine may still help with endurance. The entire point of creatine is turning ADP back into ATP so you can have more energy. This energy can take the form of lifting slightly more weight or lifting the same amount of weight, but a few more times.
As far as I know, creatine is safe to take daily, around a level of 2.5-5g per day. Loading phases are not needed and are probably not a great idea.