Both my ankles will be painful and numb when I run, why?

And there is a huge blister on my foot with water inside yet when I tried to poke, there isn't any water come out, how? And both my feet are very painful especially the heel on my right since I walking with it because there's a huge blister on my foot and its painful when I walk with it and the sensation walking with the huge blister is squishy? since its watery. anyway, should I consult the doctor or just let it be?