One eye ball bigger than other. What are my options? (Photo)

Hi Doctors, My Left eye ball comes out from socket. I was born with perfect eyes, but it started when i am 18.Thyroid normal and MRI scan normal(no tumor ), Vision normal everything seems normal, but eye ball budding.no doctor in my place can fix this. I get mild pain behind left eye. is it nervous autoimmune disorder? because before it was worst but after taking prednisone and some injection by my doctor left eye some how went inside, but not completely healed