It seems like it isn't uncommon to have lingering COVID-like symptoms after testing negative for the live culture, with varying degrees of severity [0][1][2].
Please leave your story if you've had similar symptoms. I'm especially interested in how you've been treating it and if you've had any success.
[0] https://www.wsj.com/articles/three-months-in-these-patients-are-still-ravaged-by-covids-fallout-11593612004
[1] https://www.sciencemag.org/news/2020/07/brain-fog-heart-damage-covid-19-s-lingering-problems-alarm-scientists
[2] https://www.statnews.com/2020/08/12/after-covid19-mental-neurological-effects-smolder/