I wonder if what might be helping is the salt with popcorn as a chance remark by my dentist said to only use saline rinses as a mouthwash/gargle as it’s apparently it is a known bactericidal. Yes I know Covid is viral but could there be a pesky bug sitting in sinus or throat. My PND is horrid as it fills tonsillitis crypts and causing stones on tonsils. Just little positive news it was dreadful for 6/12 probably saying too soon although still present not choking me or keeping me awake propped up and was only getting 4hrs max/night.