Try reading any fiction books you liked when you were younger, or any young adult fiction, the older the better, and things which do not contain any supernatural, magickal, or even science fiction themes.
This creates a fictional world-within-world, inside your mind, which helps your consciousness harmonise, and adjust to the equally fake “reality” we live in, and which you have become slightly out of synch with.
Old TV shows or movies you remember from your youth or which are extremely old fashioned (and again, nothinbg remotely weird or magickal) are a good second choice, as well.
Librivox also has audio recordings of classic books, try this - kid’s stuff, with a nice prickly herione: LibriVox
Don’t open the sigil or anything, just call on Varnaxis, face west with his sigil on a screen or drawn out, offer him these things for his safekeeping for as long as you need to be releived of them: VARNAXIS : Demon Of Dark Ascent
He was human more recently than most other spirits and will understand.
I found that tramadol (prescribed) placed an almost complete block on my senses, however it is habit forming and is a controlled substance in most countires afaik. I’m just mentioning this in case it’s any use.
I’ve had moments in the past when i felt totally overwhlemed and things just would NOT shut up, or shut off, as well as de-realisation and dissociation.
You CAN get through this, it’s a hazard of the path and you are NOT alone. 