Before you self-publish, writing is a passion and a burning desire. Once you start self-publishing, it can start to become a chore. Falling out of love with writing is common to all authors, and it happens to everyone from time to time. There is definitely such a thing as getting too much of a good thing.
Breakin' Up is Hard to Do
Remember when writing was a hobby? Once you start self-publishing, it becomes part of your to-do list. Now, you've got books to promote. You've got links to Tweet. You've got sales figures to check and pages to edit and networking to do and forums to check...and oh yeah, you need to get some writing done in the middle of all of that.
Self-published authors have a lot on their plate, and that makes it easy to fall out of love with writing. Many indie writers spend the least amount of time on the actual writing part. The research, the editing, the promotion -- this all takes up a huge amount of time. Creating book covers and trailers is also time-consuming. It's enough to drive anyone to the verge of a breakup.
Think back to the first question again. You've got to remember when writing was your passion and your hobby, and come to terms with the fact that your role as a writer has now expanded. All the extra stuff is going to improve your skills and expose you to more readers. While you're doing all this remembering, don't forget about the time when no one read your work at all. You gain exposure as a self-published author, and that means you've got to put time in on a bunch of other tasks.
Whenever you need to, schedule a little time to romance your writing again. Take time out from Tweeting or blogging or thinking about plots or whatever you're doing, and take a reading break. Go back to a book or short story you wrote a long time ago, something you haven't looked at it a while, and start reading. You'll see how you've improved since then, and you'll remember all those old feelings. Read long enough, and you may fall back in love with your first love (writing) all over again. If even that doesn't shake you out of your funk, give yourself a day off. Ignore social media, ignore the to-do list, ignore your email if you dare, and just take a break. Go do something else, get refreshed, and return to the page feeling a lot more loose and relaxed. You and your love of writing are bound to hit the occasional rough patch, but the two of you can always work it out.