Open every letter. Write down the dates on it, because lenders and tax authorities work to deadlines, and some of those deadlines are short. Then contact the lender or authority before the date passes. Federally regulated banks have relief options for borrowers in difficulty, and the Financial Consumer Agency of Canada explains them in plain terms.
If a legal notice has been served, speak to a lawyer. A Licensed Insolvency Trustee can also explain consolidating debts, consumer proposals and bankruptcy, and can tell you whether those fit your situation.