From the information given by you, I infer that you have developed a condition called "avascular necrosis of femoral head". The blood supply to the femoral head can be affected due to variety of reasons. This needs to be assessed to rule out the root cause. Secondly depending on the extent of lack of blood supply, there is a risk of collapse of the weight bearing part of femoral head.
Next Steps
Need to get assessed by an Orthopaedic surgeon for this.
Health Tips
Avoid alcohol, smoking, steroids as these can potentially aggravate the problem.