Gosh KitKat, I am so sorry you felt like that.
It is definitely not pathetic and you have no reason to feel guilty. Have you thought about talking to your GP about PND? Or even just making sure your DH fully understands how you are feeling.
I remember a time when DC1 was a non-sleeping, bottle refusing 7 month old, I was 3 months pregnant with DC2 and had just returned to full time teaching. I used to drive to work and pass one of those crash hot-spots which had loads of signs up stating how dangerous the junction was.
I used to drive this junction daily and would fantasise about how great it would be if I could have a car accident. Not something to harm baby, but break both legs or similar so that I had to spend some time in hospital on traction. Having no responsibilities, no baby to have to look after and being waited upon. This was my idea of heaven at the time.
It never occurred to me it was signs of depression. I mentioned to to my DH in a conversational way, rather than in a serious way. He had no idea I felt that exhausted and the talk with him marked the change where he stepped up to help much more.
So talk to your DH about how you are feeling.