Hello~I am thinking all the doctor meant was that due to your anxiety, your were having more digestive problems than normal, but it is not serious. Some folks with a hiatal hernia have this issue, my grandmother did, it was not serious, just annoying.
One thing that might help your hiatal hernia (I have one too) is too drink some very warm water, as you are swallowing it, give a big hop, this sometimes helps to move the hernia back down through the diaphragm.
I have a chiropractor that also "pulls my down" this helps as well.