Drop the weight. The weight is what is screwing up your sleep, right? I dragged my father kicking and screaming to a sleep clinic. They told him to stop smoking and to drop the weight. He decided to try smoke cessation first. Riiight. Needless to say that did not work. Matter of fact he tried everything in the world and refused ...REFUSED to drop weight. Finally several years later after a surprise physical exam (DoD requirement), my dad finally decided to lose weight. He was at the time morbidly obese, 350+. Now he never listens to me but saw what my advice had done for other members of the family. So, with his tail between his legs asked me for my
trick. He dropped 20 pounds within 2 weeks and another 30 by the end of the following month. He is still losing weight. So, it's up to him what happens next.
Definitely follow your doctor's advice and get a second opinion. From personal experience I have learned the best time to lose weight is right now not after so and so but right fucking now because 9 times out of 10 your medical is a symptom of the weight. Good luck and as always you are in my prayers.