Doesn't GRR Martin put off to the last moment writing the scenes that depress him?
Anyway, some people crave being "emotionally shattered" by "gut wrenching" books and film, and some--not so much.
A bit of humor here, a bit of cartoonishness there, can do wonders in defanging the emotional intensity of the scene for you the writer if you're not a gut-shatter enthusiast. Broadly speaking, when doing some fantasy stuff, if you go into deep mode ala Tanith Lee or Anne McCaffrey--prepare to be shaken and stirred. If, however, you pull back to a more surface-based and comic-book approach of say Rachel Aaron and Sherylin Kenyon, any chatharsis should be safely walled off.
The same planet adventure plot with the same cast, if written in the style of Gene Wolfe, can make one moody and depressed, while if it's written in the style of David Webber--not at all. Or, writing a post-apocalypse yarn in the Cormac McCarthy vein can drive one to drink and insomnia, while writing the exact same plot, but through a say Harry Harrison filter can be handled quite adequately through tea and biscuits. And so on. Delivery is important. Schindler's list is one thing, Inglorious Basterds is another, while The Eagle Has Landed or Where Eagles Dare or something else with Accipitridae in it is a third way to go.
Pulp it up and breathe a sigh of relief, say I. No need to "bleed on the typewriter" unless one is a once-a-generation genius who must burn up self in order to advance humanity and such. Or unless once is simply a bleeder-enthusiast. Some personalities are very suited for doing A, and some for doing B, and some for doing C. Figuring out where you stand is, IMO, an important step in organizing one's life along less torturous lines. Unless one is a torture enthusiast.