Please explain how "Analysis Board" works....

Hello, rookie question...

1rbq2k1/2p2p1p/p5pQ/1p1Pp3/6PP/1PbP1n2/P1P2P2/2K3RR w - - 0 18

in this situation score is around -11.

White moved h5 computer analyzed this move was "Good". Despite the loss that is coming...
With Bd2 I checked & Queen is forked! After White loses Queen still -11?

Queston1: Why does the computer not try to avoid losing the Q - with Rd1?
Question2: Is -11 score already reflecting that white will lose the Q?

THANKS!

@ DeirdreSkye: Thank you!
It seems I am not good enough to understand what the computer tries to tell me

When in the game did black play ... Nf3 as that covers the g5 square.

The analysis board grades all the most likely moves and if the score of the move made is near the top, it's considered good or excellent.  When all moves lead to losing the game, a losing move can therefore be considered good.

If you're using Windows, download the freebie Lucas Chess and, after chess.com analyzes your game, save it as a pgn file to your computer's hard drive. Then use Lucas Chess and analyze the game with Stockfish 9 (or 8 if Lucas hasn't moved up to 9).  Choose something like a depth of 12-20  and Number of moves... =15 .  Afterward it completes the analysis, you'll be able to see how it evaluated the up-to-15 best moves and that will show you when no move was really good.

 Thank you for all your answers. Because some of you asked that some critical things have gone awry earlier... yes probably - but at my skill level (~950) things are ... different.

It was my best game I ever played. Everyone has to start somewhere...

@DeirdreSkye thank you for your nice words ....
I know that only some of the good moves I made where intentionally. So I can claim that I my conscious did not deny the good moves that my unconscious brain delivered