In the Avengers age of Ultron , when there was debut of wanda and few of her powers she can get to everyone's nightmare and in that movie we have seen nightmare's of Thor , Captian America , Iron Man , black widow....
The nightmare of iron man came true In upcoming movies 🥺🥺🥺🥺...
Let's discuss about it .....
 He sees hulk dying and lying on the ground fragile and helpless , and this was also proven in the Avengers infinity war when Thanos and hulk fights with each other in Asgard and Thanos almost killed hulk and turned him into fragile beast ....

Then he sees Thor lying on ground died 🥺 , I'm happy this isn't happned yet in MCU but Thanos was about to kill Thor in endgame fight if captian won't have yielded Mjolnir then Thanos would have killed Thor ...

And Then he sees Shield of captian america broken and Captian was dying he goes near Captian then Captian says him that he was able to save every avengers , and tomy was just confused at that time , but in endgame before snap tony realised that In his nightmare cap. Was asking for that as tony from start able to protect all avengers ....