Is it normal to black out after smoke too much pot?

So me and my boyfriend have smoked marijuana regularly for the past few months and recently I took a break from it. The other night we decided to go to his friends house and the guy offered us some pot with a little topper as well. This was the first time I had smoked from a big bong as well as being sober for a week, I knew I would probably get super stoned. After taking 2 hits I instantly sat down on the couch and drank some water, only to find that everyone else in the room was walking out on the patio so I soon followed. Once we were outside my vision started to fade and I could see strobing black dots everytime I tried to look around. I was super freaked out and didn't know what was happening so I signaled my boyfriend that something was wrong. He quickly noticed and grabbed hold of me, that's when he said my legs started to shake and I blacked out. My boyfriend had to drag me into the other room and he ran to sit me up on the couch when I slowly started to open my eyes and regain consciousness. I had absolutely no idea what had just happened and I needed someone to explain to me the past 10 minutes. I don't know what happened but I know it's because I was probably to high. Just super scared about the whole thing happening again or what it is so I just wanted some feedback! Is that normal for the situation?