My sister has a chronic problem that she has been delaying to get checked by a doctor due to the covid situation. Here's the story in her own words: 'I am feeling pain in the middle of my chest and in the throat and stomach. It feels like the same pipe connecting all the points, is paining, it feels like irritation and sometimes pain is also in the back, right behind the chest. I feel it after having food and even when i don't eat at all.' So could you think of anything that this discomfort might possibly be related to or the reason behind this?