Smoking Nightmare

The other night I was with my boyfriend and friends having a good time. Everyone was drinking(besides me) and me and a few others smoked. I’ve smoked this stuff before with my boyfriend multiple times so I knew it wasn’t laced with anything. I take about two hits and wait for it to kick in to see how I feel because Im a slow smoker. About 5 minutes later I started to freak myself out. Basically I have a phobia of vomit and people getting sick and my friends coughing was freaking me out. My boyfriend asks me if Im okay and tells me I should go upstairs to relax a bit. I try to make my way up the steps and fall out after spilling my drink everywhere. My boyfriend said he rushed me upstairs freaking out about to perform CPR on me because I was unresponsive. The entire time I was out, I saw black and white(I’m assuming from the light hitting my eyes around the house while they were closed. I heard static in my ears and felt as if i was going into another dimension. I wake up to my boyfriend almost in tears and hear my friends asking if they need to call for an ambulance. I thought I was dead or had gotten hurt really badly. I lay down for a good two hours before able to come back to normal. Laying on the floor felt like I was going through the floor. This was by far my worst experience with weed and will never do this again. Does anyone know what happened or what caused this type of reaction?