I'm sorry you are feeling lonely - I had a similar situation regarding no friends until my kids started playgroup-primary school.
I moved to England 15 years ago and once I became a mum it was really hard to make friends with other mums. not for lack of trying mind you, but all other new mums already had their friends and family, so they just had no time for me.
I guess your DH is probably just tired and maybe the work dinners are so boring he can't be bothered to talk about them, or perhaps he feels you are checking on him.
Whatever the reasons, he should try and be more understanding with how you are feeling.
Does he realize you feel isolated?
I'd write him a letter and give it to him to read when he has time.
I'm sure he'll be surprised that your "nosiness" is just a surface of some deeper emotions and he'll be happy to chat to you about stuff, but if he really doesn't like talking about the work night outs, don't force it.
I'm sure that there are lot of other things you can talk about.
But by all means don't live through him.
you have to learn to entertain yourself and do things that interest you, so try and have a hobby, read a book, start a project.
don't wait for him to make your day.
I can imagine you two having lovely conversations when you can start by saying ; "listen what I found out/done today...." rather than just you quizzing him...
what do you think?