You can try a chin strap, but a "soft" cervical collar works well by keeping your chin from tucking into your chest and also keeps your jaw from dropping.
As far as the the size nasal pillow, wear what feels best. It should not be inserted into the nostril. Also, when on your side, you should be at the end of your pillow whith mask hanging off the side of pillow.
Apnea Board Administrator
www.apneaboard.com
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OSCAR Chart Organization
How to Attach Images and Files.
OSCAR - The Guide
Soft Cervical Collar
Optimizing therapy
OSCAR supported machines
Mask Primer
INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.