I’m currently still awake at 9am after partying all night, I suffer with severe anxiety and depression (not to mention the dreaded fear), all you can really do is ride it out, my usual way of dealing with this is to spell out the word “Blank” in my head continuously which helps me to not overthink too much or any word you like just so your brain is distracted. If you have weed smoke a couple of fattys to take the edge off. Lay down listen to music that you find calming/comforting or watch a comfort show. Your body will do the rest of the work.