Healing of surgery cut

Patient: Hello im a diabetics patient my bone was fractured 5 years ago.It was a compound fracture and a plate was planted in my leg.Now five years have passed but the the cut that was made during surgery has not healed .My doctor has prescribed me Chloramphenicol but it is disturbing my digestive system and the cut is not healing still please help me .I am 55 years old I cannot walk without Walker because of damage to the nerves in spinal cord related to the movement of hind limbs due to gun shots

Doctor: