I'd bring it up. It's clinically relevant and I wouldn't think he'd take it as a challenge; I would expect he'd appreciate the additional information because it would help him do his job better. Change of life stuff can definitely have an effect on mood.

If you feel awkward talking about lady issues with a male T (I know I do) you don't have to talk about it in detail. A heads-up "It's possible my mood issues of late are related to menopause and I thought you ought to know" would get the job done.

Good luck!