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I am sorry to hear this.Unfortunately there is no doubt that what you need to do is to see a family lawyer and to do so at once.
After such a long marriage you will share equally in the value of all assets acquired during the marriage, aside from gifts and inheritances even if they are in his name and even if you did not contribute to them.
And if he has been supporting you all these years then he will be required to provide you with spousal support going forward.
If there are legal or financial documents in your home find them and at least make copies of them to show the lawyer.And do not agree to anything at all with him until you've received legal advice from your own lawyer.Does that help as a starting point.