Hi,
My husband also had a very bad case of "sleep apnea." I don't know where you are, Meredith, in your husbands treatments, but it got worse towards the end of my husband's radiation tratments and continued even after they ended. My advice is watch it carefully and make sure he doesn't have a temperature. It got so bad one morning that I rushed him to the hospital and he ended up being intubated and in intensive care for 5 days. (That morning he also had 102 temp.) The doctors believed that he had developed mild pnemonia and also the radiation swelled his throat. Also, the mucus that he had was very thick and he would try to cough it up. They think he may have aspirated some mucus which caused his pnemonia. I would continue to monitor him and have the doctors check the oxygen level in his blood. (I am very non-medical but it's when then put a clamp over one of his fingers.)
This had absolutely nothing to do with being overweight and yes, I would worry about it. My husband was at least 15 pounds underweight when this happened. It was very scary to go through so I know exactly where Meredith and bobby are coming from.
BC