Will psychosomatic pain lead to a real disease. i have heart palpitation&chest tightness due to psychosomatic but i can't afford psychotherapy.

It's already real: Psychosomatic symptoms are real, and patients with them have real disease. However, it is a real neuropsychiatric disease and not a real disease of the location that the psychosomatic symptom seems to be coming from. Treated is helpful. Otherwise, a patient goes in circles worrying about perceived symptoms, and then worrying about worrying. Yes, other real diseases will follow (and more worrying).