Qb6 in the London System

It would be helpful if you posted an actual game, or position.
"I played ...h6 in the Najdorf" for example doesn't tell anyone anything really.

However, I can tell you one thing - if you focus on not hanging pieces, and always ask yourself - what can my opponent do against my position (check for safety before moving), you will be able to solve ...Qb6 in the london system, because I have feeling it's not very powerful, and you will avoid games like this:
https://www.chess.com/live/game/1957310317?username=The_Suffocater02
Possibly of interest:
https://web.archive.org/web/20140627074459/http://www.chesscafe.com/text/hansen85.pdf
http://www.gambitbooks.com/pdfs/Win_with_the_London_System.pdf
https://www.newinchess.com/Shop/Images/Pdfs/9035.pdf
https://www.newinchess.com/Shop/Images/Pdfs/7619.pdf
https://web.archive.org/web/20140627100246/http://www.chesscafe.com/text/hansen139.pdf
https://web.archive.org/web/20140708093403/http://www.chesscafe.com/text/tips.pdf
https://www.newinchess.com/Shop/Images/Pdfs/7656.pdf
https://www.chess.com/article/view/the-perfect-opening-for-the-lazy-student
and there is also the Cyrus Lakdawala book, First Steps: The Colle and London System.
https://www.chess.com/article/view/how-to-understand-openings

@kindaspongey you have a wide variety of interesting book selections, but I feel that the OP isn't asking for a repertoire on the London, but is just flustered because the opponent played a dubious move that he didn't know what to do about tactically!
... I feel that the OP ... is just flustered because the opponent played a dubious move that he didn't know what to do about tactically!
"... We cover various versions of Black hitting b2. ..." - IM Cyrus Lakdawala (2010)
"... ...Qb6 is often a good idea from Black, ..." - GM Ginger_GM (2016)