Hello
I feel there should be some type of muscle pull while doing the workout or it can be a muscle soreness because of excess of exercise..
Next Steps
You can take a warm water bath and let the warm water fall on your shoulder directly, you can alternatively do icing also as this contrast treatment has a very good effect.
Health Tips
Avoid any heavy wt lifting
If it is too much painful then you can take any muscle relaxant with your doctors advise.