Sounds like you are suffering from an anxiety attack. They can be very nasty and sometimes do feel as though you have unwittingly taken hallucinogenic drugs. Of course, the more anxious you get, the more worried you get about the anxiety, and therefore you get more anxious….
I know that telling you to try to relax is a bit like telling you to try to drink the Pacific Ocean, so I won’t. I sometimes find that Scotch can be a short term fix.
I’m used to it now, so I just try to ignore them until they go away. Sometimes the OH helps by distracting me by demanding answers to obscure maths problems – which actually works surprisingly well.
Sorry, I realise that’s not a massive help, but it’s the best I’ve got.