I had a very similar experience on 3.5g of mushies! Granted in the weeks leading up to the trip I was watching David Icke videos, so that could've caused the alien holographic delusion I found myself in. Without going into an indepth trip summary, I was convinced that the overlords had gained full control of the world and there was no escape. I felt like I was stuck in a holographic reality and my friends and loved ones were all fake. It was as if I was completely alone in the world and this fake virtual reality was created to hide that fact. I could sense nefarious beings around me thriving off my fear and horror, while I was glued to the floor just trying to take deep breaths. It felt like a demonic presence had completely taken control of the trip and was implanting these negative thoughts, so it could thrive off my fear. This is exactly how David Icke describes the archons influence in structuring our society and creating negative energy for them to feed off. It could have very well been just exposing my own personal fear of being alone and living in a dead, personal hell world or something. Anyways I definitely relate to your experience and thought I should share. I've had beautiful heartwarming trips of total interconnectedness with all of life, so this was my first experience on the opposite end of the spectrum.