They may be trying to cover themselves by telling you officially that your sleep apnea is severe and it may cause your death. They may be right but CPAP is not always the way to go even though it is what the doctors prefer. Read about my experiences ( I did not do CPAP ) at http://snoringandsleepapnea.info/
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What I found in the end is that if you are overweight, weight loss is the key. I lost down from over 200 to 143 and it almost went away. I am back up a few pounds and it appears to be getting worse so I will lose some more weight.