had a pill and my mate offered me to try shabs, i'm totally against it but at the time i felt really good and said why not. had 3 tokes and ate a small amount of rock. for the next 5-6 hours i was flying, felt wide awake and extremely energetic. at around 5 am i took a shower and layed down in bed to get some sleep. after climbing into bed, getting into a comfortable sleeping position, my heart began to race really fast. i tried to overcome it by not thinking about it and just trying to relax, but it got worse. i timed my rate which was pacing around 150-170 bpm. i could see the beat on my chest. breathing became difficult. got extreme chest pain. felt like i was going to faint. i got dressed and walked down to a medical centre. i was in so much shock and pain i just felt like i would drop dead. surprisingly when i got the the medical centre i felt relieved, decided not to go inside but rather lay down on a bench, felt better 2 hours later. never felt such extreme anxiety before.
also got similar anxiety attacks after a high dose of caffeine. the anxiety keeps me awake for 4-5 hours. my heart beats really slow, breathing is so shallow it just feels like it'll stop if i fall asleep.
alcohol got me there also, after drinking 12 standard drinks in half an hour the buzz came on too sudden. everything spun and i got really dizzy. stumbled to a bench and leaned over to the side. jim beam and beer was pouring out my mouth like it was from a tap. puking so much i couldn't breathe. the taste of the 2 mixtures and the food was so hideous that i couldn't stop puking for 30 minutes. never experienced it that way before.
Even 40-60mg of MDXX will mask a pretty high dose containg K pill. Pure ketamine powder isn't the greatest reaction on mandelin. Nothing like MDXX. So it would just show a dark colour.