I have left side whole body pain from head to toe...

What is the most likely diagnosis ?
according to your complain it suggest conversion disorder but still to be investigated to roll out any medical cause like CVA
What is conversion disorder ?
Conversion disorder is characterized by the presence of neurological symptoms in the absence of a neurological diagnosis .
In other words, the patient has symptoms or deficits affecting the senses or motor behavior that strongly suggest a medical or neurological condition. However, the pattern of symptoms or deficits is not consistent with any neurological disease or medical problem.
How the diagnosis is being made ?
the diagnosis can only be made after a full medical and neurological workup has been conducted.
It is also important to emphasize that the person is not intentionally producing his symptoms
What is the treatment of conversion disorder ?
symptoms have been successfully treated with a behavioral approach in which specific exercises are prescribed in order to increase movement or walking, and Cognitive behavioral therapy, changing irrational thoughts and confronting them with real thoughts and strict examination results, psychotherapy also includes relaxation techniques, biofeedback and confronting inner thoughts and underlying fears.
Medicines used to treat and relieve stress:
Selective serotonin reuptake inhibitors (SSRIs), or SNRI like Cymbalta