I havnt slept in 3 days (repost edit)?

I work till midnight usually and get to bed between 3-5am, last night I took sleep aid and it did not work, I am still awake and I ocassionally fall asleep for an hr and wake back up, I noticed that when I wake up, my heart is beating really fast and I'm super exausted. Once I post this itwill not let me edit bcuz I'm on my phone but I am 18, could this be serious