First of all, you haven't even tried yet. We only recommended that you do this a couple of days ago and you haven't done it. Calm down.
Tell her that you will be taking care of your son on certain days and then stick with it. If she gives you a hard time, then speak to a L. She can't withhold your son from you.
"During our chat yesterday she mention the house will be sold."
These are only words. DON'T BE AFRAID OF WORDS AND THREATS.
"I really do not want that to happen."
Understand that it's what she wants to happen. It doesn't mean that you have to let her do it. Just validate her feeling that way and then don't bring it up.
"And if I want to concentrate on my son, i have limited time only"
Again, you have to start demanding more time. Come up with a schedule and give it to her. You're concentrating too much on how to get her back. Follow the steps first and be patient. Do something that will help calm you down. Meditate, do tai chi, anything to calm you down.
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.