We work more with right hand therefore it gets more weak, first thing you should do is sit elbow supported and use a foot rest as hanging arms will make neck muscle work to hold it, that is the reason our neck muscles get overuse tightness resulting in reduced circulation and body-brain connection gets weak with it. Visit a physio to Strengthen neck muscles and get your posture corrections.
Next Steps
visit Sukhija Physiotherapy, follow good Posture and learn Strengthening Exercises.
Health Tips
While sleeping on side use 2 pillows, one under head and other between legs. Secondly if lying on back don't use pillow just have space between legs. All that to keep neck and body aligned.