Had to stop work for 3 weeks for cancer surgery and employer stopped my pay. Is this a form of termination or constructive dismissal.

Hello,

Unfortunately if you need to take a medical leave of absence from the workplace your employer is not obligated to pay you. However, the company does have to continue your benefits. This is not a form of termination or constructive dismissal. You can ask your employer to issue a Record of Employment stating you have to take a medical leave of absence so you can apply for medical Employment Insurance benefits from the government.