Looking Up 2 Columns To Return Value From 3rd

I have to lookup values from 2 columns and return a value from the 3rd col. I went through previous posts on this forum and was able to get the values. But I corrected the data and am trying to do this again but I only get the #N/A response.

Here's what my data looks like:

Col F Col G Col O
Unique ID Drug Choice
3.1 Heroin 2
3.2 Cocaine 4
3.3 Beer 0
4.1 Heroin 3
4.2 Cocaine 3
4.3 Beer 1

And herez the formula I am using
INDEX($O$2:$O$2277,MATCH($P$2,IF($F$2:$F$2277=Q2, $G$2:$G$2277),0))

where O2:O2277 is the col with the Choice values.

P 2 corresponds to Heroin that I have to look for in Col G and F column corresponds to the Unique ID.