Dear Cherryblossom,

I understand. You are right, it isn’t fair. These people treated you badly and they get to stay there while you have to struggle.
I also understand that you feel that this company is your best option where you are. But consider this: you already worked at this company and the result was very painful to you, on a physical level as well as emotional one.

So maybe it seems like the best option, but it is not necessarily so. From my experience I know that the atmosphere at the workplace, working with and under good people, is very important. It is actually more important sometimes than salary and conditions, because working in a hostile environment, as you experienced, is awful.
I’m not suggesting you shouldn’t try to get back to that company in another department as you wish to do. I’m only saying this so that maybe you will not see other workplaces as necessarily so much worse and this place as being necessarily the best. Maybe things are not always as they seem, maybe if you got a job in a place that pays less but with nice people you would end up happier every day? It is very difficult to enjoy your life when working in a toxic environment. And maybe this being such a popular place to work in, people get more competitive and mean with each other there…?

But again my point is NOT – don’t go back there. My point is – even if you don’t manage to go back there, it doesn’t necessarily mean you would be miserable in another workplace.