CHESS UPDATE
"I'm not by any means the best advice you can get here, but here are my thoughts.
You can win your pawn back a variety of ways. I always play Nf3 eventually eyeing e5 as another attacker for the pawn or g5 to bump the bishop or other low level tactics, but I also go with Qc2 pretty often.
That bishop is blocking in their center pawns and will hinder the black bishop's options because it can't effectively develop out the center.
If you develop normally against Be6, your position should end up better and you'll most likely win that pawn back on top of it.
Edit for your edit: If they defend with the queen, you have Nc3 which both develops and bumps the queen. If the queen continues to defend it's either Qc6 or Qe6. Qe6 runs into the same problems as the bishop on e6 in the first picture, Qc6 takes a key square for the knight, and if the knight comes out the other way, it blocks the white bishop. Either way development problems for black. If the queen backs off the defense, they've wasted time and you win the pawn back."
https://www.reddit.com/r/chess/comments/478ai2/in_the_queens_gambit_accepted_what_happens_if/
"In last week's column (http://www.chess.com/article/view/twins) we discussed this exact situation and analyzed the games where players sacrificed their Queens to clear the 'e' file and start a decisive attack against the Black King. Today we are going to discuss a typical and very common pattern that has the goal of clearing the 'e' file by sacrificing a piece on the 'e6' square.
The only requirement of this pattern is you need to have a Rook or the Queen on the 'e' file so after the clearing sacrifice on the 'e6' square your opponent's King starts feeling the heat right away.
When you sacrifice a Knight or a Bishop then as a rule you don't even need to calculate a lot, since you immediately get two pawns and an attack for the sacrificed piece. Since a Knight or a Bishop sac is by far the most common kind of sacrifice on the 'e6' square, you can find literally hundreds of such games. Here is one of them from the classical heritage of the Soviet Chess School:"
https://www.chess.com/article/view/tactical-patterns-everyone-should-know-sacrifice-on-the-e6-square
But what does it mean in the Qgame?