Quoting Batman ♥:" Roll with the punches and before you know it, this'll be over."
Batman has given you the most important advice.
As difficult as this all feels, it will pass and you will both be fine.
Take good care of yourself. If you don't, he will end up raising your child without you.
Enjoy the time you have with your child. It is golden and short.
Don't obsess about the little stuff.
You are not responsible for what the other parent does. You are responsible for how you respond.
Your child will look back at how you behaved. Make sure you will be proud of yourself.
Try to get a copy of a little book called, "Dear Judge, Children's letters to the judge". It will give you the children's view of their parent's behavior in child custody cases.
Hang in there. It will work out.