Zofran is it safe or not?

So I've been hearing some talk about Zofran (used to help with nausea and vomiting)... A friend sent me a link about heart problems with babies born to mothers who used it. 
Honestly, I have severe morning sickness (yes I was diagnosed that way lol)
I still vomit daily at almost 20 weeks and I am nauseas for hours on end everyday. 
I couldn't eat for so long and was hospitilized many times. 
Anyone have a negative experience with using Zofran?