hello Sir! The problem that you are facing is likely due to plantar fasciitis. This occurs due to an inflammation in the connecting fibres of the foot muscles with the bones. The treatment includes analgesics anti-inflammatory and contrast bath contrast bath. If you have already tried this add silicon soft insole in your shoes. Even if this does not help try getting a consultation from your orthopaedic for local infiltration of Platelet Rich Plasma (PRP) or Steroid between the fascia and heel bone. Rest from field work is the most essential component of treatment. Avoid staircase use and squatting.