There are regulations regarding maximum hours, and it doesn’t matter whether or not you used federal aid for your prior classes. That said, it is possible to receive a waiver for exceeding maximum hours - it’s not a guarantee, and it’s up to the school based on their policies. I assume you talked to an aid officer who may not have experience as a Satisfactory Academic Performance (SAP) reviewer, so they may not have been aware of the option to appeal.
You have a situation that may qualify for a waiver. Gather documentation to prove the medical procedures you were undergoing at that time. Ask for contact information for the SAP appeal committee. Follow up with the committee to find out what they need from you, and be sure to provide everything they need. Best wishes as you pursue this.