What's a mom to do?

He's four years old, but he's not potty trained. He was for a little while in the spring but apparently changed his mind. And now he tries to hold it in. Got himself so constipated that he was crying out in pain from the gas. So he's on mirilax and can't hold it in. But he tries. And my heart breaks on days like today, when he tells me he is "sitting" many times in about five minutes. He says he doesn't want to poop, no matter how many times we remind him how much it hurts when he doesn't.

So on days like today I sit down and cry. And wonder how this happened. We waited until he seemed ready to potty train and did not force it. And he did it in about a week. What went through his mind that he'd rather sit in a dirty diaper than clean underwear? And I cried when at a playground a child he did not know told him he stinks (he did). Is he going to start getting teased at preschool too? I don't know if I could handle that.

If you're reading this (I'll be shocked!!!) and have some advice, please don't think I'm rude if I ask you not to share it unless you've gone through this. Because we've heard and read just about everything there is about potty training. Unfortunately most of it applies to a child that has not regressed like this. But of course hugs and encouragement are always welcome. Though that's not really why I wrote this. I just needed to vent without boring my friends and family yet again.