Coming to the realization that you might need help is a significant first step. Depending on your life experiences and belief systems, this step can be particularly difficult because of the stigma of mental illness. Mental health problems need treatment. There are different types of treatment and types of professionals that can help people recover from mental health disorders.
Most people turn to their doctors when they feel they may need help with a mental health problem. the National Institute on Aging has a guide for older adults that can help with communication including a section regarding the discussion of sensitive subjects.