Although your question was directed to Dr Stephen but it was not answered for a long time so i am discussing this with you.
A chest pain
with which you walked 13 kms or which disappeared with change in posture is not anginal (heart attack
like). it more likely to be a local pain the cause for which can be deciphered by examination only. Since you have a heart murmur
, details of which are not known to us, and have non-anginal pain and tingling sensation
, they may point to one benign anomaly of heart valves but it not possible to make a definite comment. i would request you to see your doctor for knowing cause of this pain.