Fully vaxxed here. Felt real crappy 12/18, tested positive for Covid. Got on Paxlovid via my Doctor due to a pre-existing condition. Tested negative 12/24. Today, 12/29 I woke up feeling pretty awful again. Took test and am positive again. Same covid, or different strain?

Symptoms started with day before, diarrhia, then set in with incredible nausea, stomach pain, mild scratchy throat, intense left cranial headache, body soreness, mild nasal drainage and strange intermediate nostril clogging, and extreme fatigue. Is there a particular strain that lasts this long and matches my reported symptoms? Why didn’t the paxlovid take?