I suffer from severe depression, OCD and panic disorder. 
4 years ago I found 4 cat puppies hidden in a shed.  They had their mother who came to them every now and then.  But I have a bad feeling, sometimes I heard them cry I'm afraid they died and it torments me that I didn't help them.  This came back to my mind now that i hope i will take a pet. 
I think maybe I could have adopted them and maybe I would be better and they would have been happy. :(