Pain is a subjective sensation and it’s quality experienced by a person depends on mix of factors such as mood, current situations and belief about from where pain is arising. If no medical cause can be found for pain then we term it as psychosomatic pain. Psychosomatic pain triggers are as follows Most probably trauma at the might have caused disability which is affecting a person’s ability to function to his full capacity which in turn affected his mood person develops depression. If a person is depressed he may perceive severity of pain differently

Answer to your first sentence is "possible". But it is important to take the doctor's opinion ( the doctor who has treated you for trauma). It is important to rule out any physical problem before saying that it is Psychosomatic

This thing needs psychotherapy If It doesn't improve then add on medications.

First it’s necessary to differentiate between organic and psychosomatic pain which can only be thought of when your treating physician rule out all organicity