I'm trying serotonin right now because of <a href="https://www.pennmedicine.org/news/news-releases/2023/october/penn-study-finds-serotonin-reduction-causes-long-covid-symptoms" rel="nofollow noreferrer">https://www.pennmedicine.org/news/news-releases/2023/october...</a><p>:shrug: if it's working. It makes my stomach upset so at least _something_ is happening.