I found an article that does not exactly fit what I have experienced in the past though in my earliest years it did.
I think you may experience something along the lines that I have slightly later in life where the output to the meltdown can be slightly controlled (Unlike in this article I will show) but it was not a temper tantrum either. For me, meltdowns are rare. I did however get them often until I was around six, where I was told I could have killed another child, and from then on they turned into very physically noticable shutdowns, where in the past up until that age, I didn't get shutdowns.
https://www.psychologytoday.com/us/blog ... nd-tantrum
Now in adulthood, meltdowns for me were rare. Once every few years or so... And they happened after days of pressure building up. Due to having red behinds, I never really did havemuch of a temper as my Dad kinda beat it out of me, and I am greatful for that, but instead I would get mopey moods. My Dad, however either had tempers or meltdowns. To be honest, the way he had them he had an element of control in that he did not physically lash out while in one, but they lasted the whole day and no ond could pull him out of them, not even himself. He would go to bed and stay there until the next morning, though sometimes he would recover by early evening and then watch TV and relax to recover until he went to bed again. For him they would be the sort of triggers that would take me into a shutdown. A sudden unexpected decision change he could not cope with.
For me, as an adult, the few times I have had a meltdown I have had a very stressful day thathas built up and up and by evening time comes my mind recalls things and I have to put them right and I have known myself cyxling my bicycle at motorcycle speeds up a 1 in 4 climb (25%) and there was no way I could normally go up that hill and cycle home at those speeds on the bike, even though I was at one time a cyclist who could take on professionals at events (Though I never rode professionally and kept to offroad racing as it was safer). What I am saying is that in those days where I could take on nearly any cyclist as I was at that level, this was something else again! This was superhuman level! If I could time when this would take place I would easily be able to smash world records! Now that was just in the build up to a full on meltdown as when it got close to its peak, I would be in my bedroom, hold my pillow over my head and be scared to move as I knew if I directed any force into any direction I would not be able to stop, so I just held myself down and it really felt like my brain was swelling inside my head and was about to explode! And the pressure built up and up and got soo much that I really didn't know how I would survive anymore without my head bursting open! And when I thought it was about to burst open as there was no way out but for it to burst it suddenly ended! I was in sudden peace and calm but so exhausted I would immediately curl myself up and fall into a peaceful sleep!! ! It was as if it hadn't happened! I would sleep in total peace, and wake up the next day as if nothing had happened!
Now that is not the sort of experience it was said in the link. It is definately not a temper. But what they describe as a meltdown it does not add up to exactly like that either. As in the hour before it peaked I cycled down the hill with a note to put something right that was on my mind and cycled the three miles back which normally took me 25-30 minutes due to the hillclimb involved and I did it so fast that my parents didn't know I had gone and I can't have been out the house for more than 20 minutes if that. The time I did it in on the bicycle was the same average time I would do it in the car. On a bicycle I had the strength and energy to zip up that hill as quick as my car could and I am talking about a decent car! (Though due to type of road which was narrow and had many blind corners, even though I had a fast car, the times were of speeds of 30-40mph even for the Volvo T5 which went down to 5.7 mpg on the steepest bit of the climb!)
But while all I could do was hold myself down under my pillow when it peaked, I did have control on the leading up to it even if I did silly things as I wasn't thinking straight because all.past wrongs would come to my thoughts, and come at such speeds that I didn't think I could think that fast! (I am normally a slow but deep thinker).
But shutdowns are different. Shutdowns happen with sudden triggers or an accumilation of more minor triggers. Usually am partly shut down and then a sudden decision change on top by someone, or a sudden extra change or something I am not ready to cope with and a full on shutdown can occur.