I am astounded that you have chosen to post about a very sensitive and painful subject on AIBU. I wonder why you didn't post in relationships where you'd get a more sensitive hearing.
I am also astounded at posters laying into you saying you are BU. What's reasonable, or otherwise, about a longing to have a child? There's no rhymn of reason to it, yet it pumps on regardless. It's not reasonable or unreasonable, it just is.
I stopped having children because the whole shebang packed up. I cried buckets, even though it was hardly unexpected at my age. Nonetheless, I'd have one right now (and my mother is the same - at 84). It just is a very powerful impulse.
I don't think you said anywhere that you have considered leaving your husband. You are just saying you don't know what to do - you are desperate, you have tried everything to accept your husband's decision, you have had counselling. You have tried it all, the very strong impulse to have another child has not diminished, you don't know what to do.
Personally, I wouldn't like being told 'we'll see'. It's not the way I would expect to be addressed as an adult, also about an extremely important decision. Now he has become brutal and admitted that the 'we'll see' was in fact a delaying tactic. I would be very unhappy with that.
Now he says he can't take your 'doom and gloom' - about a very important decision. I'm not liking the sound of him here. He may or may not be being cruel - heightened emotion, fear - but he is delivering it in a cruel way. He may feel very strongly that he doesn't want another child but cruelty isn't the way to deliver it. I would expect to have a clear and open discussion about this, given its importance, not be fobbed off, placated or blamed.
I assume you are bereaved? I am so sorry. Bereavement of any kind doesn't just disappear over time, but it is especially intense when it is a child/ren you are grieving. Go back to counselling, these things can take a while to work through - 6 weeks, or whatever, won't cut it. Go on your own for a while to get your bearings then, possibly, go with your husband. If he has form for patronising you then you may want to carefully consider whether a counselling dynamic is the right thing for you. If, however, his 'brusqueness' is because of the intensity of his emotions around this then counselling would be a safe place to carefully (and respectfully) pick through this painful decision together.
I wish you well OP.