I, along with everyone else here, it seems, would say it is controlling because his behaviour is stopping you from either resolving whatever the real issue is or identifying the nature of the problem or agreeing on ways forward to try and improve the situation - he has all of the control and you, the 50/50 partner in this relationship - have none - he is taking away your share of control... so of course, it is controlling.
Is he acting like an adult do you think? Does he deal with all problems this way? Do you think he is blaming you for "whatever-the-problem-is"?
Something needs to change and unless you get your heads together and try and come up with some ideas you have your feet set in concrete. I dread to think of the impact on your kids and I say that because my kids are just in their early 30's now and I know (from frank conversations with them) that the problems we had with stress about workload, job security and unemployment were things that they very definitely felt and I can say we under estimated how much of an effect all of this had on them... I thought they seemed fine at the time.
Married 8, together 18 really doesn't seem that long to me TBH. We were together 19 years before we even got married but that was from 12 through to 31 and we've just turned 64 and our relationship has never been the way yours is now in spite of many, varied ups and downs - the kind of things that most couples experience.
Do you think (and I'm speculating here) that your husband learned this behaviour from watching his own parents deal with problems in the same way? Change really is long overdue IMHO - it really is time to do something - I doubt many people would put up this for long but regardless, you're very unhappy, you and your kids only have one life - how many more years of this do you want for all of you?
Your husband seems physically worn down with work and maybe there is pressure and an unsupportive workplace - maybe he just plain hates his job.
Consider this: How do you think he's going to be coping in 3 or 5 years time when he's older?
It's going to get harder isn't it? (I guess). So, I understand, it may be difficult or may seem difficult to get out of one job or line of work or career and into something else - it usually is difficult - but imagine if he got made redundant, for instance... he'd have to face that problem of changing anyway wouldn't he? If work stress and/or depression is the problem he needs to start having a conversation with you about what can be done. It's bloody terrible the way some jobs and employers just crush people - (and it's not weak or flawed people at all IMHO) - it's no life worth living is it?
I think you need to try and bring it to a head ASAP - this is no way to live. I'm really sorry to hear about your situation.