Maybe take a break? You want something new.... Like... I don't know...... the NEW EXPANSION that just came out? Tomes are how they extend the end game until they can patch in the rest of the story and new, new stuff. How exactly are they to keep up with ppl who break through the expansion in a week?

I just never understood this and I've been playing MMOs for a over a decade. Just..... breathe.... Enjoy yourself, if the grind is wearing you out it's a sign you need to smell the roses a bit. Go to the Gold Saucer, do things just for the hell of it for a while. Not because you feel you have to.