腳跟痛(calcaneus pain)

I am a 22 years old guy suffering calcaneus pain for 2 years. At the beginning, I could stand for half an hour, but after that I started to feel pain in my heel especially calcaneus. Unfortunately, my situation is getting worse and worse and now I cannot even stand for 5 minutes without feeling pain and the pain is even spreading to my ankle. Even when I sit, I still feel uncomfortable for my both foot. I have visited different doctors and they just gave me some anti-inflammatory medicines and I tried many methods such as physiotherapy including ultra-sound wave, shock wave therapy and chinese 跌打針炙. I have done MRI as well, but it does not seem to indicate any reason. I would like to ask is there still any way to treat my pain. Is steriod injection a way worth to try?

Thank you very much!