LOS ANGELES (AP) — When Demi Lovato was diagnosed with bipolar disorder, she was actually relieved. She says she “felt very, very depressed.” She adds she didn’t know why she depressed, even though she was playing concerts and living out her dream. After a family intervention, she sought treatment and learned she has a mental illness. Lovato is sharing her story and encouraging others through Be Vocal: Speak Up For Mental Health. It’s an effort to improve treatment options and erase the stigma around mental illnesses. The initiative was launched yesterday by a pharmaceutical company, the National Alliance on Mental Illness and other mental-health advocacy groups.