i have bipolar 2, and my creativity comes and goes like a yo-yo, or more accurately it swings from one extreme to the other like a pendulum. when it hits its high i write many hubs, cant keep up with the ideas. when it is at its lowest, i cant think of a single thing to write. this used to bother me, but now i just accept it because there is nothing i can do about it. even when i can think of something i simply have NO desire to write it, and my thinking isnt organized enough to put one together. if this isnt your case and you simply cant think of something, well, what are you best at or what are the things in life you love most, are the most passionate about? choose one of those things, do some exrtra research on it and you will soon find your mind teeming with new ideas. good luck.