Texas does not have a "legal separation" status. You and your spouse are either legally married or you're divorced. To get your spouse medically checked for a chemical imbalance is next to impossible without the spouse's willing participation. If you think there is a medical issue, try to get your spouse to have a complete physical running all the necessary lab tests. You might also try marriage counseling and raising your concerns during the counseling process.
Or, after 44 years... you could file for divorce which I don't recommend unless your marriage and life need such a drastic step.
I am not intending this to be legal advice, because I don't know the particulars of your situation. Call me if you would like to discuss this or other isues.
You would need some seriously compelling reasons to force medical examinations on an unwilling person. Texas does not have a legal separation status. You can be married or not married. If you want to stay married but change the way the law addresses your income you can consider a marital agreement.
Legal disclaimer: The response above does not form an attorney-client relationship, nor is it intended to be anything other than the authors educated opinion.
Texas does not have legal separation. A court can order a psychological or psychiatric evaluation of a party although typically it would be done where children were involved which is not your case.
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