What frustration did NBC News correspondent Morgan Chesky express after his COVID-19 diagnosis?

Morgan Chesky expressed frustration primarily due to facing difficulty focusing because of mental fog after his COVID-19 diagnosis. Mental fog, often referred to in discussions about post-viral conditions, includes symptoms such as confusion, forgetfulness, and a general lack of mental clarity. This condition can significantly impact an individual's ability to perform regular tasks, maintain productivity, or engage in cognitive activities—especially pertinent for a journalist, whose job relies heavily on focus and mental acuity to report news accurately and efficiently. The experience of mental fog post-COVID-19 has been reported by many individuals, highlighting the cognitive challenges that can arise alongside the physical symptoms of the virus.