Hi
Mostly it looks like psychosomatic disorder,
The underlying reason can be depression or anxiety, A psychosomatic illness originates from emotional stress manifests in the body as physical pain and other symptoms like fainting and problem in breathing.
Next Steps
please consult a physician first to rule out other medical disorders before calling it psychosomatic, even you can get treatment for your physical symptoms which can control anxiety.
Health Tips
please keep yourself busy in work or learning something new like music or international language or some life saving skill like swimming or Marshall arts,
this will give you confidence and slowly you can come out of your problem.
thank you.