That sounds awful!! I can understand why you might feel terrified whenever you spot ants in your house. I think I would try to get the offending ant identified, because it could be the sort of ant that is rare, or that are usually outside, and unlikely to be running around in your house. I think it would bring your anxiety levels down to know this important information.
Samantha, 45 yrs
Stopped smoking Jan 2013. Diagnosed Left sided UC, 8th Feb 2014.
Pentasa 3.5g daily, Vit D, Multivitamin, Vit B12, 500mcg Molybdenum
Gluten, Dairy and Sulfite free.