I second Dr Chanakarn. He recently dealt with my long lasting Achilles tendon issue by prescribing anti inflammatory and muscle relaxant tablets plus stretching and walking modification exercises. After 4 months it is almost totally resolved at a cost of a few thousand baht, compared to a surgery proposal by a top line hospital at a cost of 130000 thb. Oh, he is also team doctor to the national sports team so he knows what he id doing. His clinic is very busy and does not take appointments but I highly recommend a visit. Google Maps is your friend.