Dear Dr.rynne ,I Have Been Tied When To The Hospital

dear dr.rynne ,I have been tied when to the hospital stayed in the hospital they ran test said the could not find any thing wrong with me that it was in my mind ,my potassium keep being low ,every time I go to the doctor me and my daughter are both sick ,our family doctor said it was the flue so he gave me and my daughter tamp-flue to take what could it be ,please help?