Sometimes the BEST thing to do when you are getting those crazy thoughts that MIGHT make you use IS to just go to bed. I'm in kind of a rut myself, but what I have read on this forums leads me to believe that it is par for the course.
I'm a animal lover too, but it isn't like you put the puppy into a potato sack & threw it on the highway during rush hour.(!) You took the time & cared enough to make sure that it had a decent place to go to. Maybe you can get your little cousin another, more trainable puppy who is more house-friendly.
"This too shall pass". I give it a month.