This shidduch business has gotten really strange since my day (which was not that recent 😉
Are people looking for a partner in a bayis neeman b’Yisroel or shopping for a car? If I had a daughter in shidduchim right now I would be in therapy for anxiety too!
In regards to heritability, most serious psychiatric problems are not “inherited,” or the odds are so small that they can be ignored. The only sure way to be at risk is to marry the identical twin of someone who has been diagnosed with schizophrenia. Most “minor” problems are the result of life experience (which can, however, include a difficult home situation). For most medical conditions, the problem isn’t inherited. What can be inherited is the tendency to develop the illness under certain conditions, for instance, late-onset diabetes in someone severely overweight. BTW, epilepsy isn’t a psychological problem, it’s a physical medical condition, and it can only be “inherited” by things like car accidents, meningitis, or a blow on the head.
Be very careful when thinking about “inheriting” medical problems. Most of the media reports on medical conditions aren’t the most accurate. Some of them shout that they’ve discovered “The Gene” for some condition, and the next study proves them wrong, or the specifications for inheriting it are rare.
Bottom line: Only worry about inheriting something if Dor Yeshorim is testing for it. They’re the ones with the scientific knowledge. And yes, you should get tested, and check BEFORE you get serious.