hiya, my flatmate has had the runs and tight chest where she struggles to breath for a few days now, she went to doctor and they said gastroentenitus type thing! she just went for a short walk and came back and couldnt breathe again, its bit worrying as im a hypercondriac and would like to know if anyone had ever experienced this illness and could support me and my flatmate with some piece of mind advice. thankyou.