Sunderland fought back from 3-1 down in the final minutes to level at 3-3 before Tammy Abraham struck the winner for Villa on 93 minutes.
We suffered on the field,” Emery reflected.
“It was a tough match, but we did a very good match. In the last few minutes, they scored two goals and the chance we conceded in minute 90, it was a crazy moment.
“We are always playing so, so demanding in our structure, playing organised and disciplined and trying always to play respecting each task.
“After we conceded the second goal, it was a completely crazy minute. After it, we were close to losing, but as well our plan today was to win.
“In the last minute, we pushed and scored a really fantastic goal – Lucas’ cross and Tammy’s goal. It was really fantastic.
“I finished the game exhausted. I expressed all my emotions.”
Emery also said: “The last two matches at home in the Premier League, we have won against West Ham and Sunderland, playing two very good matches.
“This is the way. The Premier League is the first priority, the second is the Europa League, and the Europa League, against Lille and Bologna, we played fantastic matches.
“We are recovering our confidence and feeling comfortable. Today, how we achieved the three points was really fantastic, but we must avoid losing the position that we lost today.
“We will keep going. I’m so happy.”