Many people have a calcaneal spur
. Its simply ossification (bone formation) at the site of the insertion of the fascia in the foot. A CRP of 15.7 is only very mildly elevated and not suggestive of a significant musculoskeletal problem. It sounds to me although you may of a non-union of the fracture
in your foot or ongoing problems with the joints in your foot which have not healed together properly. This could be further investigated with standing X-rays of your feet and cross-sectional imaging such as an MRI
and/or a CT. You should be referred to an orthopaedic specialist for assessment.