I got fired for a knee injury that happened out of work. They wouldn't find alternative work for me to do. Can I sue for wrongful dismissal?

Yes you can. You are likely entitled to both wrongful dismissal damages and human rights damages. In terms of severance pay, please visit the Severance Pay Calculator (http://www.severancepaycalculator.com/) to determine your entitlements or contact our firm to discuss this matter further.