I am 22 years old. Recently, I have shifted to a new place for my education, and since then, I have started experiencing nightmares every night. I get up from my bed with a sudden jerk, wide-open eyes, having a tight sensation in my chest, and feeling deprived of oxygen. Why is this happening to me? Is it a symptom of a heart attack? I feel scared as people at young ages are suffering heart attacks. Is it concerning? What can I do to get rid of this?