I would agree that unless he has some strange symptom I haven't heard about (which is possible I guess) he shouldn't need you to be always there. Even at my worst when I couldn't do much at all my wife was out at work full time every weekday - she had to do almost all the cooking, cleaning etc because I couldn't really stand up for any useful length of time but she certainly didn't have to stay at home with me constantly.
You and your son deserve some time out of the house trying to do something enjoyable. And you'll be less use to your husbnd if you end up having some sort of nervous breakdown so it's better for him if you do things which reduce your stress levels too.
And try not to take the video and all the things you 'should' be doing as a criticism. It sounds to me like you are very caring and are doing a great job in very difficult circumstances

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