That area is your stomach as well as your diaphragm and can go into spasms. I have found that taking a homeopathic remedy --- Magnesia Phos every 30 minutes will relieve the spasms. Just use it when you have the spasms. Several doses may be needed.
My wife has been taking a bottle in her purse for about 20 years. She also uses it for her H. hernia. It works and she does not leave the house without it!!!