If you just had coolsculpting, i would not use heat. after any procedure which injures tissue there is a period of inflammation and swelling. using heat increases the swelling and inflammation and may actually cause more pain and slow down your healing
There are several different options. The most effective would be revising the lipo with either Tickle Lipo or Vaser Lipo. Non-invasive options include Thermismooth, Sculpsure or Kybella. The best option for you would be determined after evaluation your situation.
Thank you for your question. There should be no issue with you undergoing CoolSculpting treatments if you are healthy and have no issues related to the hiatal hernia. That being said, my advice would be to consult with a board certified plastic surgeon in your area so that they can examine you...