 mental or emotional health issues. Symptoms of mental illness can include appetite or weight changes, pulling away from regular daily activities, being sad or having feelings of hopelessness, a change in sleeping habits or noticeable changes in mood or energy levels. The FDA suggests several ways to manage mental health. Make sure you're getting enough sleep each night. Take care of your physical health by eating well and exercising. If you see a health care provider, make sure you stick to their recommended treatment plan. You can also find a support group.