Thanks for your question on Health Care Magic.
I can understand your concern.
By your history and description, possibility of
musculoskeletal pain is more.
But better to first rule out heart diseases because left sided chest and
shoulder pain are commonly seen in heart diseases.
So get done ecg and 2d echo first. If both are normal then no need to worry for heart diseases.
Naproxyn is only a painkiller. Better to take combination of painkiller and
muscle relaxant drugs. Along with drugs, do following lifestyle modifications for better symptomatic relief.
1. Avoid heavyweight lifting and strenuous exercise.
2. Avoid bad postures in sleep.
3. Avoid movements causing pain.
4. Apply warm water pad on affected areas.
Don't worry, you will definitely improve with all these, but first rule out heart diseases.
Hope I have solved your query.
Wish you good health. Thanks.