I have a lot of allergy like reactions but most of the tests came back negative, so we had to dig deeper. Eventually my allergy doctor told me I am hyper reactive for a lot of things which causes e.g. nose obstruction, sinus infections, shortness of breath, problems with my intestines and skin reactions. Due to the use of medications I got adrenal insufficiency, which means my body has difficulties making cortisol. Cortisol is important in stress situations. When your body isn't able to produce cortisol you can get an Addison crisis, which can lead to shock and eventually death. I am always carrying my medications so I can stress dose in stress situations like fever/illness, surgery, trauma etc.