One distinction that dsm-5 makes between acute stress disorder and posttraumatic stress disorder is based on:

It depends on the amount of time that of the anxiety symptoms.

Anxiety is often characterized as excessive worrying which comes to the point where people would find it very difficult to handle. Most people with anxiety under DSM-5 experience physical problems like restlessness and tiredness. People with DSM-5 have been experiencing anxiety for more than 6 months.

take a break move to stretching and slowly work back into physically exercising if the problem continues go to a doctor or physical therapist