That happen to me the other day and I thought maybe once someone else posts after you, you could no longer edit. However, someone noted the other day that there is a time limit on how long you have to edit.
Not sure of the purpose of removing edit, but it is, what it is.
So if you are going crazy, it is not a result of the disappearing edit.
Edit: Geez, I mention the thread and here it is sitting one section below in Problems & Difficulties
http://www.thefret.net/showthread.php?t=5087
Good thing I noticed it in time or I wouldn't have been able to edit.
Maybe crazy is contagious.