I'm 29 was very athletic but last year I suffered a heart attack and when I woke up I could no longer talk or walk. now ive recovered from being hospitalized before and relearned to walk but this last time put me down for awhile. im wondering why I can no longer relearn to walk, if I try to use a cane I cant go forward without losing balance.I work out all the time, bike and pullups but I cant get the strength to move forward when using a cane. is it a core issue?