Hello my name is Sueli, I've been using the same tennis shoes for about a year now. I am now realizing that I need to change my shoes because they are getting a bit old now. In result, I bought new shoes and for the last two weeks my heel on my right foot has been hurting very bad as if I'm walking on nails. Also, I never had this problem before. I've read online that it might be because of low magnesium but I am very healthy. I am a runner and lately I've been have trouble with that. Is there any way you can help me with this problem? Thank you.