My understanding of the reason PROMO games are so fking hard X)
It took me 5 series to get from plat V to IV and 7 series to get from plat IV to III, and i will share some of my observations over the match makings.
Tl;DR: It is not the anxiety that make your promo games so hard, it is actually the match making system that made it as hard as possible.
Few things that match making will do to you:
Counters:
The system will looks through your match history and find your counters (champion you lose the most when you are against them) then place them into your enemy team.
What happened in my Promo: I'm a Fiora/Jinx main and as i know my counters are Nasus, Vlad, Maokai for fiora (Pantheon is always banned), and lucian/kalista for jinx. They are almost in every single fking promos i had so far Fffffffffffff.
How can you deal with it: expand your champion pool, the higher elo you get, the worse it gets, better get ready to play something else so you ain't countered.
Nemesis:
The system will looks for people who are experienced and good at dealing with the champions you play the most.
What happened in my Promo: There ain't many who go against Fiora alot, but hey , when you see enemy mid/top/jg running exhaust and use it on you every time you know they are super experienced with going against Fiora, and I found a lot of them in my promos.
How can you deal with it: Same as above, play more champions.
Terrible teammates:
Did you found your teammates sucks? Are there a lot of trolls afker ragers and ETC? Match making system will look for people have bad match history and place them into your team, because they are on tilt, they are more likely to rage, or just play poorly.
What happened in my Promo: Rager in almost every single game, they are plat games, and not many people rage anymore when they reach plat. Way too much ragers in my promos.
How can you deal with it: Just.... play nice i guess.... probably just stomp your lane, roam a lot, end the game ASAP, so that you give no chance for them to make mistakes.
Promo Destroyers:
I believe that the match making system also looks for people who fk up alot of other people's promo and place it into your promo series. They are the worst, because they troll in other people's series, they will find a random reason to start trolling, or to fk your game up.
What happened in my Promo: A brand keeps calling me bronze because i asked for a lane switch after Nasus rushed a frozen heart (come on, who's the bronze here?) he also agreed with the lane swipe in champion select then suddenly changed his idea. A J4 clain he will never gank top due to the fact i ping for help 2 much. And some random people who just troll overall and refusing to actually play .
How can you deal with it: Nope, fk it, 4V5 in high elo is almost impossible.
BTW:These things are not obvious in lower ELO because ragers\trolls are average player and also a silver player playing your counter is a completely different thing compared to a plat player playing your counter.
What did you notice in your promos? plz share with me X)