All of a sudden my 10 y.o. Husky has become uncontrollable! Digging out, constant panting and restlessness and we're at our wits end. He's only recently been neutered

He's just been neutered? At 10 years of age?

Have you talked to the vet about this behavior?

Panting, restlessness... time to see a vet and get a thorough check-up! Sounds like it could be a medical problem. Is he drinking more water than usual? Please make an appointment.