Hi.
Sepsis = sistemic inflamatory response to an infection.
I think you have to go visit a doctor immediately, and get some blood tests done, like
WBC (white blood cells) count and blood cultures, and X-ray images, and maybe some CT (computed
tomography) or MRI (magnetic ressonance imaging) images (if you haven´t already done any of it).
If an infection is confirmed, you may be struggling with an
osteomyelitis, or a deep surgical site infection, both severe and potentially fatal conditions.
If you still have an infection,
cortisone shots would weaken your immune system, and the result could be worst.
I´m not saying you have an infection, but that the possibility of infection must be discarded.
Good luck.