Allergy test i took to nuts, fish, milk, soy, was negative. this means, there is no reason for the tongue to swell, and kill me? i have health anxiety

Allergy tests: The tests you had done were food allergens. Although it is encouraging that they are negative, there are other things you could be allergic to, such as aeroallergens: pollens, grasses, trees, weeds and even animals. Any kind of a reaction to allergen could cause tongue swelling. There are other causes of tongue swelling, but allergies & trauma are most common. Not common to kill, though.