SvenIronhand

Thanks NeuroTypical. This wasn't a troll post. I got my answer and that's that. She was being poisoned by her psychiatrist. Too much lithium in her blood made her go crazy. 
To other posters thank you for your replies. However don't take suicide lightly it's a very serious thing and also be gentle and kind. Some people get offended very easily. Have a great day.

Fixing someone's suicidal thoughts with premarital sex?  Yeah, no, not the best idea.
"I tried everything else but nothing worked" - her problems are not yours to fix.  They are hers to fix.  
If I were you, I'd postpone the wedding, read a bunch of books on suicide, attend some premarital counseling sessions.  I would not marry someone with unresolved suicidal issues - it's not fair to either of you.

Folks, if OP wishes to contribute further, he will.  No need to second guess his genuineness.  I remember back in the day, I agonized over a very personal question I was terrified to ask.  I remember creating a dummy account and posting the question from a public library on the other side of town.  I was able to sift through all the answers, and I never went back to that account.  With a few decades hindsight, I was going overboard on staying anonymous to ask my question.  But it was the biggest thing weighing on my mind at the time, and very embarrassing.