A woman who is "allergic to everything" can only eat oatmeal and says fish, nuts or mustard could prove deadly.

Caroline Cray, 24, first realised something was wrong when she ate an ice cream and went into anaphylactic shock - spending 12 hours in hospital - in September 2017.

She had three more severe allergic reactions that month to bread and pizza.

After eating rice and beans with her family, Caroline reacted again and spent 12 days in intensive care.

After 10 months of tests, she was diagnosed with rare chronic illness mast cell activation syndrome (MCAS) - which causes repeated severe allergy symptoms - in May 2018.

She now has a diet that consists of just oatmeal and EleCare - an amino-based acid infant milk - and says everyday things such as fish, peanuts, nuts, sesame and mustard could prove deadly.