Hi
ford1934 Fellow "rescuer" here, although I'm in remission at this moment
While you may be right about the suicide note being a manipulation, it's tough to tell and I'm learning to always err on the side of caution. Your son's willingness to work with a psychiatrist is a good sign, and it sounds like s/he is aware of the recent suicide note?
As the others have said, you've come to the right place for information and support. We understand better than anyone else ever could what you're going through.
Many of us have had success with the communication tools here on the site, we are learning together to let go, to stop rescuing. You're ahead of the game there, you are FREE
My suggestion is to read all you can about BPD and Randi's books and those she recommends are a great start - it certainly helps to have the knowledge, to know what we're dealing with. bpdfamily is also chock full of information, clinically responsible articles, workshops, and best of all, others who are traveling a similar journey.
I hope you stick around and keep talking about what's going on, experts will agree that a strong support network is critical when dealing with these intense relationships. We are here for each other. Ask any questions you like, read and post in other's threads, it will help to build that support network.
Again, Welcome to The Family!
~ OH