About the screaming...
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I don't have an autistic child, and I'm totally working off things I've heard, so take what I say very lightly...
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Isn't it true that autistic kids often hear/see/feel things that most of us don't? For example, the buzzing of a light, or the tick of a celing fan can be the loudest and most pervasive sound to them. And it's very annoying, and all of those sounds, etc are very over stimulating. Is it possible he's less frustrated and is over stimulated? Can you set up an area for him that is super quiet and calm? Is it possible that he is stressed out by environment and just one more thing (like the stimulation of changing his diaper) is just too much for him?
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I was just thinking that when I have an issue with one of my kids, and no matter what I do it won't go away, if I think really hard I can usually come up with an unmet need in there somewhere. Their verbal limitations, combined with lack of life experience prevent them from knowing how exactly to express their need, and they keep up with the behavior in spite of everything (or they morph it into something equally a problem) until I figure out how to meet the need.
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If you are just not making any progress, maybe looking deeper to fix the cause might eliminate/lessen the problem.Â
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As far as your marriage...
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Dh and I have gone through some incredibly stressful times together. And they have been very hard, and, at times, nearly breaking. For us, it is absolutely imperitive that we be on the same page. We don't have to agree, but we have to agree how we are going to act. So there are no surprises for me, and no nagging for him. Like, he hates spending money on the dogs. He was a farm kid with farm dogs. Basic needs were taken care of, but that was it. My dog is my friend, and that costs more...like the 700 surgery he just needed. Our deal is that he can't stress about dog money or be annoyed that I spend it, but I have to remember that this is my project. If I can't sustain in time/energy/money my dog hobby, the dog has to go. So, we don't agree, but have a working relationship with concrete parameters about it.
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With your ds, you each need to see you are in the long haul, and to evaluate what your personal needs are. Does your dh need to know that no matter what kind of day your ds had, you will leave him with a sitter and give your dh your undivided attention one night a week? Do you need your dh to understand how tired and scared and stressed you are, and that you need him to kick you out of the house with a $10 and make you go to starbucks for 1/2 an hour to recharge, as much as you may resist? Do you not agree on what to do in the moment? Do you constantly correct or suggest things to your dh? Being on the same page prevents that, and there has to be some give and take, and continued conversation. You need to work to get to a place where it is you and dh vs. autism. And you and dh and ds vs the world. Being a team player, instead of against each other, changes everything.Â
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Hugs, Mama.  I can feel that this must be very, very hard.