Your mania could be hypomania. Just a thought. It's not as extreme as "full blown" mania, but is still existent. Regardless of what it may or may not be, it's best to speak to your doctor about any and all symptoms you have.

I hope that getting it out at least makes you feel better in the moment. Depression can be an evil mistress at times. Vicious cycle. Creativity is hard for me to come across when I'm depressed. It's more there when I'm euphoric, elevated. Then, i can't stop it. I do find that not trying to force it helps. Just take creativity slowly. I hope you can find something that works for you. Take care.