I went through a similar experience to the one that your currently experiencing. I think, and don't get me wrong i'm no expert, just my opinion, that the reason that you feel so bad is because of the stress put upon you by the dwp. Other people will have had this happen to them so your not alone and the citizens advice will know what to do. It seems like a heartless thing to do to you. But I think that when it's finally sorted you can put it behind you an start to build yourself back up. I hope it's sorted soon.