I think it is just that you are exhausted to be honest.
Try counting just how many of us are or have been where you are now, and compare with how many have to "tip them out" in the mornings. My impression is that most of us struggle with this at the beginning, and some of us just have to struggle harder or for longer. But I bet there are some things our little insomniacs do better than the sleepers!!
You were right to get out. But as he was so distressed today, try leaving him alone in another part of the house for very short periods at first (less than 5 minutes) gradually building up over the next few weeks. I'm sure he will figure out eventually that you always come back!
Try not to let guilt creep in, our pups don't! And it is good to get him used to being on his own for short periods both day and night.
Hang on in there!
I had a bad few minutes during the walk home from school, but then Buddy was so cute a few minutes again that he has me in the palm of his paw (?) once again!
Oh! Just saw the PMT bit....that's where I was the other week when my in-laws were here. Bad isn't it, on top of the lack of sleep. Well at least that bit of it will be over in a few days Hon