If it sounds like wheezing, your first step is to call your local reptile vet and set an appointment ASAP.
Step 2 should be done right after you hang up. What kind of enclosure are you using? Tub? Tank with screentop?
How are you heating the enclosure? Lamps? Heat tape? Heat pad? How are you measuring the temps? Are you using a thermostat?
Humidity - what is the humidity? How are you measuring the humidity?
Pictures of your enclosure will also help.