I almost gave up on one of my seedlings for this years outdoor run. It started out like all the others, hit its 3rd set of leaves, and stopped for over a month. We were going to toss it, but the wife felt bad for it, so kept it. It started growing all of a sudden and was the runt of run. Had an early hermi so a box opened up in the swamp, It was a sickly looking plant when we brought it outside, all yellow, starving, eating itself. After about a week of feeding, it blew up.
It's one of the tallest plants in the swamp now, budding and smelling phenomenal.
If it's still alive, don't toss it, it could snap out of it, and turn out to be something nice like what happened to me.