J.D.
My little girl had HFM about a year ago. It lasted about 5-7 days. We used teething creams in her mounth before feedings and before bed. She didn't like it very much when we gave it to her, but I think it helped with the pain once her mouth was numb and she could eat better/more and rest easier. She really had bad sores on her bottom/diaper area. If that happens, I would recommend using a vaseline in place of regular diaper rash ointment. It helped to "protect" the sores when she wet or soiled her diaper. Also a luke warm bath seemed to keep her distracted because she loves water!