A caveat: Some second-hand stories may be akin to "ex-gay" stories. That is, it's unclear whether the person willingly made the decisions for themselves, or whether they felt forced to cave into outside societal pressure. (or a third possibility: that their expressed views have been distorted by an intermediary for ideological reasons).

• Mike Penner/Christine Daniels — born male, they came out in April 2007 and was apparently well-accepted in their workplace. But then they resumed their birth name 19 months later, and 13 months after that, commited suicide.
  • there was lots of press about the detransition
• the movie "Regretters"
• 1998 study by A.J. Kuiper, Ph.D. and P.T. Cohen-Kettenis, Ph.D.
  • layperson summary
• Examples of cases of "regrets"
• regrets, detransitions, retransitions
• detransitioning statistics, Wikipedia