Apply ice pack, correct your posture.

It's disc bulge... Manual therapist like me,can push your bulged disc back to it's normal place naumika.com

Because of the medication the pain sensation is reduced but the muscle spasms need few more days to recover. Do mild stretching and start isometric strengthening exercise for neck muscle. Learn correct postures from physiotherapist. Most of the pains are due to biomechanical cause. So treat it mechanically or chemically.

Start strengthening your neck and shoulder and upper back muscles . Also try to use a right pillow while sleeping.

Hot fermentation and stretching exercise of spine

Continue Physiotherapy. Tho can be because of muscle spasm or radiculopathy. Improve ur posture and use thin pillow

Use cervical pillow. Use Back Support. Self Massage the back of neck.

Hi.. There could be someother irritation left in the neck that could trigger mild muscle stiffness leading to such pain and weakness. Need to evaluate your issue to see if there is any restriction in range and less mobility in the joints of neck and shoulder. Nothing to worry.. As of now keep icing your shoulder and neck.. This should help you to fix your problem for now.. Once pain comes down follow it up with mild exercises.. Mobility exercises