Ouch I have the same thing going on now, only ever happens on one foot but am currently walking on one foot normally and the other on tip toe.
I trim off as much dead hard skin around the cracks without it hurting. I should use moisturiser but always forget.
I second or third the podiatrist suggesstion and should heed that advise also lol.
Happy girl it is utter pain to use the cream on cracks, i mustn't have seen hat insruction