Thanks for choosing healthcare magic. I understand your concern. Your pain is more likely due to muscle spasm of your neck as a result of poor posture during sleep. It is very painful condition but it is totally recoverable and is not associated with any serious complications. Following are some of the ways that can help you treat yourself. Stretching: Spasms are best treated with stretching exercises. Massage: You may be able to massage your neck yourself by finding the tight muscles and putting deep pressure on these muscles. You might also get a massage from a friend or therapist. Medicine: You started taking mortin but in addition to painkillers you need to take muscle relaxant too which i mostly prescribe is moovax (tizanidine) 2-4 mg twice daily for three days.Remeber Nonsteroidal anti-inflammatory medicines (NSAIDs) may cause stomach bleeding and other problems. These risks increase with age. Read the label and take as directed. Do not take for more than 10 days. Ice: Put an ice pack, gel pack, or package of frozen vegetables wrapped in a cloth on your neck every 3 to 4 hours for up to 20 minutes at a time. Moist heat: Sometimes, especially with recurrent spasms, moist heat can help. Moist heat includes heat patches or moist heating pads that you can purchase at most drugstores, a wet washcloth or towel that has been heated in the dryer, or a hot shower. Don’t use heat if you have swelling. Physical therapy: Your healthcare provider may recommend seeing a physical therapist for an exercise program and other treatments. Stress management: Neck spasms are a common physical symptom caused by stress or depression so try to avoid excessive stress. I hope my answer is helpful for you but if you have any ambiguity do contact me. Get well soon :)