Take one day at a time. I know it's hard I left my girl's dad after 13 year's. I left him when our youngest was just 2 year's old. Things will get better, I promise. It's going to be a long hard road, but you need to be strong for little one. Cry, but cry when he can't see you or hear you. Redo your home, if it has to many memories of the past, and have your son help you ( i know he's only 3) but have him smell candels to see which one he like's, let him help pick out a pillow for the sofa (I know it might not be company type of design, but if you do it together you'll start feeling better) If your exhusband was controling, do something that he never would have allowed you to do ( as long as it is safe for you ad your baby boy). Now is the time when you need understanding friends and family for you to lean on, i can't "reach out and give you a hug" but I am here if you need to talk/cry to someone. Like I said it's going to be hard, but it does get better. You will start noticing you will be crying less and less, and the "heavyness" in your heart will become lighter. good luck and take one day at a time. Just remember that you have a new beginning with your son, so the biggest advice that I can give you (as corny as it sounds, but it's my new philosophy) "live life through your childrens eye's, you'll be seeing things for the first time"