My STBX and I also share the same GP, I mentioned MLC to him, and he seems completely ignorant.
He said my STBX looked fine, and hormone levels are fine. He asked isn't that something that happens to men in their 50s? Your W is too young at 42. If she doesn't love you it's because she is having an affair.
He said my BP is high, and I must be stressed and depressed, and prescribed me some ADs.
I am still surprised after a year that this is somewhat common... I spoke to two men at work who recently got divorced, and both indicate that their x had MLC. Both are in their 40s. My Brother In Law is divorced from his ex, also was in her 40s... said the same thing.
Either way, no matter how common, most people are not aware, and think I must be a horrible spouse.