How bad does applying for mortgage effect credit score

[Frankie Betancourt]

Hello yes how bad does applying for mortgages effect credit score because apparently i have applied for a loan on a house 6 months ago..and it fell trough and then my realtor wants me to apply with a diffrent lender since the conventional loan fell trough..  then i just applied for a home equity loan when i wanted cash out refinance loan and they sent me wrong application and i already filed it and credit score went down and now i must resubmit another application again..and loose credit score again