I have cervical disk herniation in c4-c7 region. what should i do?

Not good: It somewhat depends on the extent of the herniations, but this can be very painful and debilitating. Injections and sometimes surgery is required.

Yes: Any disc at any level can deteriorate and or rupture = herniate and cause pain, neural compression of roots or cord. C is cervical numbers from 1-8 usually. C-8 followed by t1. Thoracic.

Pinched nerve: Causes neck pain and pain down your arm or into the shoulder area. Usually responds to meds, pt but if it doesn't then surgery is necessary

See below: Not sure what your question is, but it sounds like you are doing physical therapy which is good place to start. If symptoms persist, then surgery may be necessary.