I'm sorry to hear about your severe neck and shoulder pain and difficulty lifting your neck. Muscle spasms can be very painful and sometimes limit movement significantly.

Given your symptoms—sudden increase in pain, inability to lift your neck while lying down, and muscle spasm despite taking Flexon MR Tablet (which contains ibuprofen, paracetamol, and a muscle relaxant)—it is important to take the following steps:

• Seek immediate medical evaluation: Difficulty lifting your neck and severe pain could indicate a more serious issue such as nerve involvement or injury that needs prompt assessment.
• Avoid strenuous neck movements: Rest your neck in a comfortable position but avoid complete immobilization or awkward postures.
• Apply cold or warm compresses: A cold pack may help reduce inflammation initially, followed by warm compresses to relax muscles after 48 hours.
• Continue medication only as prescribed: Do not exceed the recommended dose of Flexon MR Tablet and avoid alcohol as it may increase side effects.
• Watch for warning signs: If you experience numbness, weakness, fever, or worsening pain, seek emergency care immediately.

Because of the severity and sudden worsening of your symptoms, I strongly recommend you consult a neurologist or an orthopedic specialist as soon as possible for a thorough examination and appropriate treatment.

If you experience any emergency symptoms, please contact emergency services immediately at Apollo Emergency - 1066.To narrow down potential causes, we will need some more information.Please tell me your age and gender.