After giving birth I continue to vomit 5 – 19 minutes after eating?

Hi i’m a 25 year old female. I’m trying to find out why i’m always throwing up 5 to 10 minutes after i eat anything. It all started after i left the hopital after i had my daughter. My head twitches sometimes and my right hand twitches then it feels really light and i constantly drop stuff when using my right hand. My right side of my stomach has a dull pain after i vomit and i have lower back pain sometimes and all of this is sudden.