Nearly every AD I know of, carries warnings that they may make depression
worse in teenagers/young adults
. Sounds like that might be what happened to you. Yeah, I bet it was scary.
Your depression could very well be caused by thyroid, but sometimes, we have to treat the symptoms, individually, until we get the underlying issue solved. That's what I had to do, though I fully understand that we are all very different and what's right for me, won't be right for everyone else.