Bad weed experience help?

I know it's wrong before anyone says anything about it, but I've smoked about ten times and they were all really fun time, laughing, munchies, sleeping. Then we got some weed yesterday from someone though my friend, I didn't really think anything of it. So later we smoked two bowls and I was laughing way too hard and it's a blur then when we came back into the house my heart rate was pounding out of my chest, literally I was freaking out. The room had a weird yellow tint to it and then my friend had to tell me to take deep breathes and it worked. But what caused this?? I've never had this before