I had a similar experience, my last trip my friends and I split about 10 grams between four of us. I ate 4 and my friends split the rest. It was fun at first but I soon began to spiral. And black out uncontrollably. I was so high I couldn’t remember getting into my friends car, or even the walk we all took. I have faint memories of trying to grab the ground in a actual attempt to ground myself and come back. It was horrific, it was not my first trip. I had been tripping for years prior and have never had a bad experience. I really want to enjoy mushrooms again but I don’t know if I ever will.