Please do not stop seeing your son. Two year olds are remarkably difficult, and even if you don't see it, the mother struggles with him as much as you do. Every parent of a toddler has wondered "what is going on with this kid?" at some point, but as frustrated as we get, remember that it will get better.
I would encourage you to find ways to make the transition easier. Offer to call him on the phone an hour or 30 minutes before arriving so he knows time to shift parent is coming. Have something comforting like a blanket or a distraction like a song he likes, waiting for him on the car.
Just come up with ideas that will help him associate you with good feelings. As for discipline, may be it is a good moment to evaluate exactly how you don't allow him to get away with everything. With children this young, the best thing to do is to remove him from the situation that makes him act out.
If he is throwing a fit at the park, take him to the car until he quiets down. If he is trying to reach an object he is not supposed to have, take him to the next room. Being severe with a two year old, punishments and yelling, will not help you.
Their brains are young and do not process cause and consequence. Maybe pick up a book about toddler brains and their behaviors to better understand him. It doesn't mean you will let him get away with everything, you will just be acting according to his age and abilities.
No matter what you do, don't stop seeing your child. Children change on the blink of an eye, soon enough he will be older and you will have better days with him, even have fun together and these moments will be only a memory for you. He won't even remember.
To him you will always be his father.
He needs discipline in his life. From what you say it sounds like you are the only source of that. He's still really small but later on in life I think he'll realize who really loved him an was the better parent.
If you abandon him now what kind of person do you suppose he'll turn out to be?
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.