Jesus Christ, OP, just read the post about washing machine, wild water rafting, diving ... etc. etc. etc. Sociopath? Psychopath? No kidding - sounds like attempted murder, to be honest. And with the washing machine, BARE BLOODY WIRES? Putting your dear children at risk, along with you? Sorry to be harsh but you're still with him? Sounds as though you're under a sort of malign magic spell cast by him. HE WON'T GET BETTER and he's destroying you, your son, and soon your daughter, too. If some ghastly accident doesn't happen to them thanks to his idiotic 'thrill seeking', he'll grind down their esteem, personalities, confidence - your poor poor son is already on the way to all that.
Please, OP, wake the hell up. I've seldom been so distressed reading a thread. I know you're suffering the after effects of hip surgery - I had a hip replacement, it went perfectly but it was still horribly painful afterwards, so what you're going through after a messed up op, I hate to imagine. But you can start being pro-active immediately - get decent legal advice, split off your finances (and STOP paying for his holidays), and - yes - forget couples counselling because he'll be learning what's on your mind to use against you. Lundy Bancroft's book advises against joint counselling and the book is an absolute bible for women in your position, so do read it.
I spent 20 years married to a sociopath and he was charm personified to the world - fun, generous, gregarious, life and soul of the golf/rotary club etc. But in reality, a nasty, faithless, mean and spiteful man. I regret those 20 years - stayed for sake of kids. Boy, do I regret it. I got out when I was nearly 50 and never looked back.
Please, OP, you've had some amazing advice here from MNs. I hate the thought of you waiting longer - did you say in earlier post something about June next year? Hell, you shouldn't have to wait another week coping with his shit. And meanwhile ... he's off on his hols, again, LEAVING YOU LIMPING AROUND, IN PAIN, TO COPE, while upstairs your darling son is in emotional hell himself and your sweet daughter is anguished about everything that's going on.
Sorry for the epic post. I just feel so angry and frustrated for you.