Thanks for your question on Health Care Magic.
I can understand your concern.
Your pain is relieved by gentle pressure, so possibility of
musculoskeletal pain is more.
But since it is left sided
chest pain better to first rule out cardiac diseases.. So get done ecg and 2d echo.
If both are normal then no need to worry for heart diseases.
Musculoskeletal pain is more likely in your case.
So avoid heavyweight lifting and strenuous exercise. Avoid movements causing pain.
Avoid bad postures in sleep.
Take painkiller and
muscle relaxant drugs.
Apply warm water pad on affected areas.
Don't worry, you will be alright.
Hope I have solved your query.
Wish you good health. Thanks.