Isn't it convenient that he blamed you for calling the police, said it was all your fault, and this 'assessor' says the same things?
Is there even an 'assessor'? Or did he tell you he was going, and then nick down to the pub?
Common sense, even the common sense possessed by a goldfish, tells you that NO professional would say it is wrong to call the police on a missing suicidal man who is drink driving. For fk sake, even a child would know that. There is not a single professional in the world who would say that. And then blaming you for his drinking?
What 'assessor' do you think would give a heavy drinking depressive an excuse such as you are controlling therefore he can't 'help' his heavy drinking or driving drunk?
Seriously, no person with an IQ above 40 would believe that. It doesn't even make any rational logical sense, for a professional to blame you for his choice to drink heavy and drink and drive. That is, just......is not rational.
OP, I feel for you. I grew up with an alcoholic father. But you need to be honest with yourself. There is no 'assessor'. He never went to one. Did you wait outside the office? If not, you have no idea where he went. Even if he did go, he is certainly not telling you the truth, he is making up outrageous stuff that anyone knows just wouldn't happen.
He blames you for everything, then comes home and says this so-called professional said everything he said to you, and then to cover up his tracks, he puts on an act pretending to be upset with this 'assessor'. If this 'professional' exists, you will be able to ring them as his wife and next of kin and speak to the person (if they exist, I lay you my entire house along with home and contents insurance, my car, and 2 years worth of salary to boot that they will say your husband 'didn't show up for his appointment'). Suggest to your husband that you ring them, and/or attend the next appointment with him (I really don't know why you didn't go with him). Then see his reaction. It will tell you everything. I guarantee he will get agitated and make excuses about why you can't come or why ringing the assessor is a bad idea.