So I was not expecting the extreme discomfort I felt when the drug began to take effect . I suddenly felt like I could not breathe at all , my heart was pounding , I felt dizzy and disoriented , and the room looked dark , like someone had either dimmed the lights or put a dark gray tint on my glasses . I was really afraid that I would pass out and fall off of that high table on to the floor . I struggled to breathe , and there was pressure , hard pressure , on my chest and neck .

Generate a question about the above context.
Why is the narrator experiencing balance issues ?