Can my son, who is a US citizen, file for me so that I can come back to the country?

Generally, when he becomes an adult, a U.S. citizen may apply for his parent to receive immigration benefits. A careful analysis of your removal/deportation would be required in order to assess your future eligibility to be the subject of a family-based application and to be able to return to the U.S. Aside from the express terms of any court order for removal/deportation, many people who overstay their visa become subject to a 3-year bar to re-entering the U.S. (if they were unlawfully present in the U.S. for more than 180 days but less than 1 year), or to a very harsh 10-year bar (if they were unlawfully present for more than 1 year). There is no substitute for having an immigration attorney carefully review all the details of your situation in order to be able to advise about immigration eligibilities, options and strategies.