While I don't have Hypopnea or Apnea, I was diagnosed with Idiopathic Hypersomnia. I did have to go through the same tests as you plus another. Almost everyone I've talked to that got the CPAP, loves it. I think that most people that would hate it, don't even bother getting tested. Not everyone that has Hypopnea or Apnea are overweight. That's a big 'fat' myth! My husband is 6'0 and 145lbs! His dad is 5'11" and probably not more than 150lbs... I bought my husband a Tempurpedic neck pillow and it seems to help a lot with his breathing. I'm not sure that it would help you though... My hubby has OSA. Hypopnea is different.
Let me know how it works for you! I hope all goes well.