Is it sad that I am afraid to buy the next and final books of two different series just because I don't want to have to go through the troubles and pains of finding ANOTHER really-good-literally-can't-put-it-down-cry-yourself-to-sleep-cause-you-finished-the-last-one-too-fast-series?

The Immortal Nicholas Flamel
http://www.randomhouse.com/teens/alchemyst/

And

Pendragon
http://www.thependragonadventure.com/