Visit physiotherapy centre

At  this age changes tend to happen  give a break  time after  40 min of work  leave your chair 

Change your sitting posture. Do isometric exercises of neck. Use small pillow. In working station try to sit straight and if working on computer level the monitor screen to eye.  Take breaks in between and eat plenty of waters and do not take too much coffee or tea

Chiropractic adjustment will help. Stretch claves Get a custom made insole.

In my experience, treat Ur gastric issue first - U can take more fibers, veggies, fruits. Move regularly, drink plenty of water, avoid prolong sitting in one position. You can also do some clockwise anticlockwise massage at Ur abdominal region, regular bowel movements are a must. Do not hold your urination or bowel, whenever you have urge plz remember to empty yourself. Once your gastric issue is better, your neck and shoulder pain should reduce tremendously. Also remember to do some stretching exercises and make some ergonomic changes for your office environment.

You should take proper ergonomic advice for your work station changes according to your neck condition

Avoid prolong sitting & consult to physiotherapist  for your posture correction & pain management

Yes... U have to change the u r working hours and maintain u r position like erect position. The desktops or laptops are equal to the ur eyeline ,don't bend the upper body . Consult the physiotherapist.... To take modalities for reliving the pain

Apply hot water formentation over neck and upper back.

First he will use cervical brace, then proper chair, while sitting office and home. Take x ray see the orthopaedic dr, then go to physiotherapy clinic . Physiotherapist do the treatment...

Check your posture for abnormal changes.

Use of long time computer, laptop avoid it. Avoid forward neck bending don't use high pillow.