Yes of course I heard it from Rabbonim. I went to shiurim about Shmiras Haloshon and I asked specific questions. This is a very big issue and as I said, there is someone out there for everyone. You just can’t take it upon yourself to go spread information on everyone.
I saved 3 girls from suicide. Two of which are married today. Do you think it was my place to tell their future spouses about it? NO!!!!!! Of course it was not my place. Whatever they were going through at that time was an issue at that time. They got over it and it is not who they are today. Did they tell their spouses about it? Yes I believe they did, but it certainly was not my place to do it.
If I know that someone is on medication, it is also not my place to disclose. If the medication helps them to function normally then kol hakovod, what is wrong with that? Should they disclose it, yes they should and I have discussed this with Rabbonim. I was told by the Rabbonim that it was NOT necessary to disclose, but I don’t necessarily agree with that. Once you are well into the shidduch and you feel you can really trust each other I feel you should find a way to discuss these things without causing the other party to panic.