sorry you're going through this. Is there anyone else in your brother's life that can help him out? Perhaps when you talk to him next explain that you will be setting a time limit for him to move out etc. perhaps 1 month would be fair?

Do you have people in your life that can support you and are healthy to spend time with? As far as wanting to contact T I don't know the background of the situation, but it's natural to want human contact etc. when one is going through a stressful time. However, you're married and a T that would have an affair with a patient lacks boundaries, respect etc. and most likely isn't a healthy person to spend time with. I hope things get sorted out soon and your CPN calls you back.