Feeling of something stuck in chest. Be.

My sister is continuously having gas problem but not acidity.it feels like something is stuck in the chest area and because of that she will be unable to breath properly as well as sometime difficult to burp.she will uncomfortable as well.this issue will mostly on increase starting evening and while lying on bed it becomes more. Don't know what is this issue is this has or worth else Dr please suggest what should be done and she is faxing this issue from last March(10 months). She only is not able to figure out is this a gas or something else because as the evening starts her issue and gastric will increase and while lying it becomes very difficult to breath also and burp also. She says that something (air or something)is stuck in between chest because of which she is not able to breath properly. Please suggest something Dr.what is it could be.