Hmm yeah, I also think some of it (but not all) is due to pandemic-related stress. But I also think long-Covid is a real thing, just not as prevalent as some may think. Some research has actually uncovered legitimate immunological and imaging (e.g., chest CT) differences between long-Covid and recovered patients. This recent study is a good example: https://www.nature.com/articles/s41590-021-01113-x