I had almost the very similar experience when I smoked a huge joint with honey oil while coming up on ~4g of high quality mushrooms. I had taken seven grams before, and aside from all the vomiting, I had a great fucking time. Naturally, I assumed I could handle a measly four grams. High doses of Cannabis have always made me slightly paranoid, but up until then I had no problem dealing with it.

I had gotten greedy. My fantastic experiences with mushrooms weren't enough for me. I wanted the absolute. The peak psychedelic experience. Four grams in pitch darkness, with music and way too much Cannabis.

I was listening Tool and at the time it seemed like i was in for the best trip ever. I start getting into it, as you did. Delving deeper into the music as I allowed the drugs to take hold. The visuals became deep, and wide, and kept expanding until they completely filled my closed eyelids. I was loving it until "Rosetta Stoned" hit the apex. Now this is a very, very heavy song and I'm well aware of the effect certain music can have on my conscious state. Suddenly the joyous colorful visuals were drained of all life. All I could see was infinite repeating patterns of shades of grey darkness. I started to see this shape, a jagged, extremely menacing looking tesseract type form. It seemed to be "looking" right at me, right through me. The same way a hunter looks at his prey, right before he sends steel and fire ripping through the creature's body.

At this point I was almost totally unable to form a coherent thought. I was running on horrified primal instinct, with periodic bouts of almost-thinking.

"Why... is this?" "Dead?" "Why here?" "I am dieing" "Who I am? "Dieing" "All I am"

I was immediately hit with the most intense feelings of absolute dread and despair, as the last semblance of my humanity faded away. My soul, if such a thing exists, was on fire. The music that minutes ago I was enjoying, was now hellish and deeply horrible. My heart was beating, faster, faster.

Too fast.

I explode out of my bed and hit the lights. My skin appears to be blood red and covered in morphing scales. I feel like my body overheating so naturally, I strip down. All I know is that my heart is probably about to explode, each beat could very well be my last. After an indeterminate amount of time, I managed to phone a friend. My last lifeline, the familiar ringing brings me back to reality a bit. But not enough.

I try to say "I took too many mushrooms and I'm having a bad time", but to this day I'm not sure what came out of my mouth. Because all I heard him say was "brown-upsidedown-elephantiasis-machine-evil-primate-warmonger-toomuch"

I panic even more and toss my phone out the window. Well actually, I tossed it at the closed window. I feared he was casting some grotesque warlock curse on me. I could hear the words, but the syntax was impossible to comprehend. As someone who loves music and literature, having my ability to understand language and rhythm taken away from me was probably one of the worst things I've ever experienced.

More "time" passes, I sober up a little. I begrudgingly accept that I'm either going to die or be completely fine, and I was completely fine with that. As I'm returning to my senses, I realize how ridiculous that entire display was. I remember nobody has ever died from psilocybin. I remember that I can remember. I remember the power of the human mind. I can come back. This was the moment of peace.

I light some candles and turn the lights back off. This gave the room a very warm, living feeling which I enjoyed immensely. I turn on some Mozart, and it sounds like a cruel masochist viciously pulling on a donkey dick. But I'm okay with that. Better than the electric war drums of hell I listened to earlier. As I sit stark naked on the floor, the rhythm of the music slowly begins to come back. I start to feel happier than I ever have. Just to be there, and have a brain that is capable of deconstructing unconnected sounds and turning them into a beautiful hallmark of human ingenuity. This feeling of well-being continued increasing exponentially until the sun came up, and the psilocybin flushed from my body. I have incredible gratitude for that entire experience as a whole. To fall into the depths of hell but rise out of it unscathed. To go from a vulnerable mindless animal to fully evolved Human, all in a single night.

I ended up going completely off topic there but I noticed some parallels in your post which reminded me about that experience. Make no mistake, you really did lose your mind, but only temporarily. That's what mushrooms do. They restrict blood flow to most of the cerebral cortex. Which is what I'm pretty sure sent us both into those panic attacks, as our brains must have decided we were on the verge of death. The brain has many different survival mechanisms which will subconsciously kick in if it gets a signal that something in the body is not functioning as it should.

But yeah man trust me, you're gonna be juuuust fine. Go eat some comfort food. Go for a long walk, preferably near or in nature. Get some exercise. Spend two hours writing a comment on reddit that nobody will read. Go have sex. Drink copious amounts of alcohol and bullshit with your friends. Go visit with your family. Get on the road and just drive and see where you end up. Go do something you enjoy. Do it because you're a human, the point of life is to enjoy it. Go out there and have a good time.