In my experience, it's best to accept these things come in waves. For most of us, it's not realistic to maintain maximum creative energy for an extended period

In my experience, it's best to accept these things come in waves. For most of us, it's not realistic to maintain maximum creative energy for an extended period of time, just as it's not realistic to maintain maximum happiness for an extended period of time. Sometimes you'll feel sad, sometimes you'll feel tired, and, every now and then, you'll feel like you can take on the world. For now, embrace the pain, let it wash over you, and trust that your energy will return again one day soon.