Glad you found us, awakenow68

You must have been together a long time to have a 12 year old... yes?
You'll find members here who have "stuck it out" and have kids, and have made things better/livable. You'll also find members who have chosen to end the marriage even with kids involved. This is a great board (Bettering) to start on, because you can learn tools and skills here to "not make it worse" while you decide what is best (or, sometimes, "least worst") for you to do.
How do the "hot and cold" episodes look?
Was he "always this way", or did something happen that you can pinpoint and say "yeah, that's when it really got crazy"?
Hang in there;
kells76