Hi
DagwriterWelcome to the community
This is fabulous news, I'm too am delighted for you both, your support over the years is paying off, your son has taken on his responsibility and sought help, is a huge, significant step
Sounds like the Remeron is working, he's put on weight, is calm. It sounds like he's sleeping better, is that right?
I can understand you're afraid, I find it helps taking it day by day. BPD is often co-morbid, eg depression, anxiety so the treatment plan will likely be adjusted along the way. Does your son have two personalities? The way I view it is my 30DD has episodes where she emotionally dysregulates, mood fluctuations and periods where she is calm, in control, happy.
How are you doing, it sounds like you've been through a lot, do you have support, a family member or a friend you can talk to?
I'm glad you found us!
WDx