You are not a failure. Stability sometimes takes time. Give it time. It reminds me of the Amy Grant song, "It Takes a Little Time."

"It takes a little time sometimes to get your feet back on the ground. It takes a little time sometimes to turn the Titanic around. It takes a little time sometimes. Baby, you're not going down. It takes more than you've got right now. Give it, give it time." Not the most brilliant lyrics, but it's a catchy song and it encourages me sometimes.

From my experience, pure mania or hypomania takes less time to get under control than depression or depressive mixed states. I wonder if anyone else has noticed that.