I have a herniated disc at c6c7 pinching a nerve causing cervical radiculopathy down my arm. will the pain and numbness go away suddenly or gradually?

Gradually: A special pillow for sleeping, maybe with mild sedation. Avoid shoulder straps or holding a phone with your shoulder up to your ear. Heat and relaxation exercises. Get up from your desk frequently and walk around.

Either or: Sometimes people get lucky and the pain may go away suddenly, but most patients with a structured physical therapy program, possible medication use, heat to the area, etc.,..will see a gradual improvement. Best wishes.