Hunchback is related to your Upper back and tingling sensation in your arm maybe related to a problem causing nerve compression in your cervical spine/ Neck or maybe in your arm or hand.
Prolonged Hunchback will cause Upper Back pain and eventually leading to other health issues related to you digestive system and respiratory system ( if not taken care earliest).
Next Steps
Immediately visit an orthopaedic or a physiotherapist along with your Neck and upper back X-rays to rule out any major problems. MRI if suggested by the doctor.
Physiotherapy will definitely help to improve you hunchback problem with postural corrective exercises and also with the tingling sensation with neck and nerve stretching exercises.
Health Tips
If you are having continuous sitting job, please use a good height adjusting Chair with proper back support. Try not to sit for long hours. keep stretching your back, arms and even legs in between work hours to relieve pressures on the nerves.