Larynx removal

Hi everyone. My husband is scheduled to have his larynx remove June 1. He would love to talk to someone who has gone through this operation to know what is in store for him. He is having a terrible time swallowing and has lost a lot of weight. Does anyone have advice about reducing all the mucus so he does cough constantly. Thanks so much to anyone who can help. He is 70, disabled vet, and had tonsil cancer two years ago. This cancer is stage 3.