how to have a healthy heart

so lately my heart has been acting up. I always wanna throw up . I have anxiety. i sometimes get heart palpataitions. it’s kinda scary .. I workout once a week,, so maybe i need to start working out more than once a week? To have a healthy heart and make it pump regularly. ???what else do i need to do or take or eat .. ? I feel like my heart is getting weak maybe cuz i’m always not sleeping early and get nervous easily