Welcome Hulkster to the greatest support site online! IMHO.
Let me ask some questions, you don't need to reply here, but check for yourself maybe? What reports do you actually have in hand? The cardiologist that "told your wife" she had a mild heart attack... do you have his report... or the hospital's about the edema? Is this documented or a verbal report from your wife? If there is no record, then why not get one?

I wonder if her mother has an actual dx of hyperchondriosis? Or is this an assessment from family members... you mentioned your wife had ELECTIVE gallbladder surgery. What exactly is that? Certainly no respectable surgeon would do that on a whim? Did you mean that she had problems and one of the solutions was to have the gallbladder removed?

You wife has had a lot of stress in her life (and you too!) even good stress like an adorable baby is still stress! Hormones go bezerk especially at that time, but also during surgery etc. Will your wife see her MD or even "baby" doctor and express ANXIETY that is making her worry about this and that? perhaps anxiety is easier to discuss? Would you feel the need to go with her and make sure the MD hears how it is affecting hers, and yours, lives?

Just my thoughts. Again welcome!