tl;dr - Is it normal for 6 year olds to randomly start throwing massive tantrums. My son up to this point has been very mild mannered and not prone to getting upset. But the last few weeks have been insane.

My son (6) has been going through something that is just really challenging the heck out of me. It started a few weeks ago when we were getting ready to leave for trip to visit family a few states away. He complained that his stomach hurt and began sobbing and begging to take a bath. So we accommodated and let him take 3 baths in a single day because we figured he just wasn't feeling well. We scheduled a doctor's appointment and the doctor just suggested a bland diet for a day and see how it plays out. After that he didn't really seem to have any issues, so we went ahead with our trip.

The hours-long drive didn't seem to faze him at all and we arrived safe and sound, despite a heavy rainstorm on the way. Over the course of the trip, every time we tried to drive somewhere to meet up with family, he'd claim he was sick and if we pushed on it, he'd throw a tantrum. Which is very unlike him, to be clear. And anytime we weren't talking about a car ride, he was acting pretty normal. We thought maybe it was anxiety from the drive there? The rainstorm was very intense at times, and I can see how that could be incredibly scary for a kid.

We spent the rest of the trip hyping him up for the drive home. My wife and I both have anxiety disorders, so we tried to help him understand that we knew how he felt and offered some advice (in a 6yo friendly way, to the best of our abilities). We also maintained a relatively bland diet for him in case he actually was feeling sick. But anyway we were absolutely dreading the ride home.

Just getting him and his sister in the car proved to be the absolute worst day of my parenting life. He threw the tantrum of tantrums, which set his sister off and she kept trying to escape from the car. Meanwhile it was 90F+ outside and our car's AC doesn't really kick in until you start driving. I was hot, upset, angry, scared, frustrated and just not operating at peak parental power. There was a lot of yelling, a lot of trying to hold them into their seats so I could buckle them, and all of it obviously just made the situation worse. I really fucked it up and I'm still trying to work through it all.

Long story short, we ended up separating him and his sister, with him driving home with us and his sister driving home with my parents. Once his sister was out of the car, he calmed down and we were able to leave. The plan was to just drive off and get some gas, let them both calm down, then pick her back up.

I had to go on a work trip shortly after that trip, so I was away for most last week. In that time my wife didn't try to take the kids anywhere, for fear of having a repeat incident, but solo and outnumbered by the kids. When I got back I started trying to hype my son up for the car ride to his and his sister's 6th birthday party the next day. He tried to negotiate saying maybe we could just walk instead of drive. I explained, "no it's a short car ride, but we couldn't walk there".

When the time came to take him to the party, he threw a tantrum, but I redirected using my car's remote start fob (he really liked that) and I talked him down a bit. The ride to the party was fine, as was the return trip. Then yesterday we did a trip to Gamestop so he could pick out a birthday present for himself and again the trip both ways was fine (with zero tantrum!). Although he has yet to get in the car with his sister since we got back from our trip a few weeks back and he has specifically called out not wanting to be in the car with her.

BUT the last two nights he's started throwing the exact same type of tantrums at bedtime, claiming he can only sleep in our bed and he's sick and his legs hurt and all these other things. When told no, he screams bloody murder, starts kicking and hitting, and it's really difficult for me to handle that. The tantrums of course set his sister off and then we have two 6yo twins feeding off each other's sadness and anger like two colliding hurricanes.

Is this just normal 6 year old stuff? I know they're still learning to regulate emotions and so maybe that's it? His sister went through something like this a few months ago, but it was exclusively about bedtime. She'd throw massive tantrums at bedtime while he'd just quietly go to bed. So that kind of reinforces that this is just a growth spurt of some sort? But I'm getting concerned it's something else, but I don't know what?