Cant tell when i need to breathe?

so im trying to go to bed and its impossible because i can't tell when i need to breathe. its almost like my lungs are numb. If i hold my breath i barely have the feeling that im running out of air. I almost have to think of when to breathe. Also when i exhale i cant tell when im running out of air. I have been having problems ever since i smoked k2 which was really stupid of me and im def not doing it ever again. im 100% sure k2 did something to be and idk if its something with my brain or if its depersonalization which sounds like its a possibility. its 1:30 in the morning and i need to sleep. thanks for answering.