I once played an OTB game against someone around my rating and lost my queen in the opening . I maneged to win that game! it was 2 rooks vs. queen endgame

You give 35 c4 a "?" for a positional blunder, why don't you give losing a piece a few moves earlier a "?".

in this game you got a fair trade for the Q but I agree with the name of the forum. I have won games in spite of having lost but Q at an early stage...

Actually he WON a knight and then blundered the queen to a rook, not quite the same thing as trading.

@Salaskan

10. Nxe4 was safer Qxe4 was good though too.

You missed 22.Bg6 which wins outright

You missed Bg6 again on move 24, you finally played it on 25 although had your opponent played 24..Qg5+ he could have avoided it.

30.f4 saves the bishop so does 30.Bd6 although what you did was good enough for a win.

35.c4 is not a blunder, you didn't throw away the win and you didn't make it harder.

Losing your queen in a more or less equal position is the end of the world unless your opponent is rubbish, you were up a knight when you lost it and your opponent was quite bad :)

35.c4 fixed my opponent's pawn on a dark square and largely blocked my bishop's access to the queenside, but yeah, the game was still won.

I know that I had quite some compensation for the queen, but when I allowed Re8 (I never make such blunders even in blitz), I thought I'd lost, and my opponent indeed had a won position with my ruined pawn structure and material deficit.

30. f4 is really obvious now I think of it. But I had only a few secs left at that point (good thing we played with increment). Bd6 just throws away the other bishop.

Umm no it dosen't, please show me how you think Bd6 looses a piece.

30.f4,30.Bc5,30Be7,30Bd6,30Bb4,30.Bf8,30Kd1,30.Kb2, 30.Kb1 don't lose any bishop and probably there are more moves better then Bh5 in that position.

It isn't DOSEN'T. It is DOESN'T

It isn't LOOSES.   It is LOSES.    Such primitive mistakes in the English language.

I agree those are stupid mistakes and I don't usually make them, must be the late hour, however english isn't my fist language.

Uncompensated "loss" of the queen is never good; better to resign immediately.  As stated above, you were compensated for your queen.  This was a blitz game, so blunders are usual.