last summmer i trained in the onisuka tigers and for 400 miles. so this winter/spring i decided to get some more and its like the 4th week and for the past 3 days my achilles have been killin me.. they dont hurt when i walk but when i slow run.. i have also been running on roads.. whenever i go slower than normal for lsd it hurts but then i pick it up and they feel fine.. is it my shoes or what>?