Try using a heating pad on a low or medium setting for 15 to 20 minutes every 2 or 3 hours. Try a warm shower in place of one session with the heating pad. You can also buy single-use heat wraps that last up to 8 hours. You can also try an ice pack for 10 to 15 minutes every 2 to 3 hours. There is not strong evidence that either heat or ice will help. But you can try them to see if they help.
Avoid activities such as lifting and sports that make pain and stiffness worse.
Place a special pillow or a tightly rolled-up towel under your neck while you sleep. Do not use your regular pillow at the same time.
You can try using a soft foam collar to support your neck for short periods of time. You can probably buy one at a drugstore. Do not wear the collar more than 2 or 3 days unless your doctor tells you to do so.