Calm down, it's a rather common problem. Buy ant bait at any grocery store (i.e. Loblaws, Loeb) or call an exterminator.
If you rent your place, I'd call the super first.
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Non-Chemical Controls
* Sanitation will help to prevent ant infestations. Store food in sealed containers and clean up crumbs and spills immediately.
* Use flashing under doors and caulk cracks and crevices around windows and house foundations. Improve the screening on windows and doors to prevent entry by ants.
Chemical Controls
* Non-toxic baits are used to attract ants so that their trails can be followed to the nest. Baits can also be used to help identify some species of ants since not all species have a preference for sweet materials.
* Toxic fast-acting baits have been used to quickly kill foraging workers. Other poisonous baits are slower to kill but foraging workers take them back to the nest for consumption.
Different formulations and concentrations are available for indoor and outdoor domestic use.
FOLLOW ALL LABEL INSTRUCTIONS regarding rates, methods, frequency of application, and safety precautions. Dust formulations should only be used where people and pets cannot come in contact with them.
http://www.uoguelph.ca/pdc/Factsheets/Insect/CommonAntsinOntario.htm