Oh my, it definately does happen to everyone! I guess it also happens to successful people.
When it happened to me, I stopped drawing and writing, guessing it was for the good. I found myself starting to do it again only for pleasure, confirming it's something I truly love. I stopped studying, decided I didn't give a heck about quality, and built some projects I just enjoyed. It payed off completely: I improved in the right spots, developed a style, and people started liking my stuff more than before.
So I'd say, just take a break, enjoy something else, and then see if you can come back to it. Rememeber it's not mandatory to produce art. You might be great at anything else, and that might give you more satisfaction.
Another thing I'd suggest: you owe nothing to no one. If you don't feel like finishing the stories, don't. Be honest with your readers and they'll understand. Forced writing usually ends up in low quality writing, and a bad ending is worse than getting no ending