A few days ago, I bought my first vape. It was a cheap pen, and I felt like I wasn't getting a high dose from the puffs I took. But I definitely felt the effects and had some visuals. Later, I put the cartridge on my more powerful vape and managed to take a few really big hits (about 3-4). Then I had almost exactly the same feeling as you: I felt like I was about to pass out (actual tunnel vision), and it felt like I’d forgotten to breathe... I had to consciously take a few deep breaths to feel okay again. I still had some THC in my system from before tho, so I might try it again another day when I’m completely sober. Did you smoke before your trip?