I'm nauseated

Ashley
I ovulated last Saturday, 6 days ago.... Yesterday I felt a bit sick until the afternoon around 4:30 pm... Then it went away. 
This morning I literally raced to the bathroom because I was going to throw up! Nauseated and heartburn. I've never had these symptoms ever except with my first pregnancy! I was diagnosed with HG which is a severe case of morning sickness. I wound up hospitalized because I couldn't eat with out throwing up within 10 seconds. Throwing up stomach acid every 60 seconds, wound up weighing in at 91 pounds at the ER!!!! I'm so afraid of this again and now I'm getting super early symptoms... Is this even possible. I know it's not stress or fear because I'm extremely calm and happy person. And excited to get pregnant.