No "Happy Pills" on Premium Choice AC last I checked.
ACs in my neck of the woods spinning "Happy Pills" include My 98-3 (WMIM)/Toledo (15x), WFMK/Lansing (15x), and Cars 108 (WCRZ)/Flint (6x). It's not on WRVF/Toledo or WMGC/Detroit at all. The only immediate Detroit-area stations giving the song airplay are the AAAs.
To answer A.J.'s question about "Give Your Heart a Break," Cars 108 is spinning it 5x a week. It's #28 on Mediabase as of today but fell as it decreased from last week by one spin.
These terrestrial stations are listed as "leaders" on it (spinning it 8x or more per week)
KYIS/Oklahoma City - 24x (looking at their playlist though, they look more Hot AC than mainstream AC)
WHUD/Hudson Valley NY - 14x
KVIL/Dallas - 12x
WWZY/Monmouth-Ocean - 10x
KOST/L.A. - 8x (a little surprised to see this one playing it, as they have an older/softer lean)
Airplay leader is indeed "The Blend" with 25 spins.