"Acute stress" refers to a brief period of intense or overwhelming stress. It could be caused by a sudden pressure or situation that puts a lot of pressure on a person. Full definition
Following a head and neck injury and a prolonged period of acute stress, I felt so bad I literally thought I was dying. (adrenalfatiguesolution.com)
When these symptoms last only a few weeks after trauma, it's usually called acute stress disorder or ASD. (health.com)
Heart rate change has been used in a few previous studies to evaluate acute stress response, although primarily in indoor laboratory settings. (sciencedaily.com)