Well day 3 and it has been tough. As long as I don’t see her my emotions are easy to control.
Hang in there! It'll get easier with time.
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I’ve been staying at work late and getting home when she is in the bed.
Don't go out of your way to avoid her. Your attitude should be "I'm going to do what I want to do in my own house, and if she wants to avoid me then that's her problem."
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We haven’t talked in 2 days other than her texting me. I tried to not respond but eventually I responded with vague answers to her questions.
What type of questions? If it's bills or kids, then reply. If she's asking you what you're doing away from home then it's fine to be vague.
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She wants to come to my ballgame Friday night? Should I tell her I don’t want her there. She was going to bring my son but I could get someone else to bring him.
If it was just her then I would agree with ovr and just not respond. But if you need someone to bring S there then I would probably go with something like "I would like S to be there, if you are going then please bring him, if you're not then let me know so I can ask a friend to bring him." The idea being you could care less whether she's there or not, but you want S there.