Another vote not to over think and I believe it's chicken-egg and ultimately does not matter. The meds are take are tools that support my sobriety, which includes (perhaps most importantly) my emotional sobriety. They are part of what help me work a strong program.
I take a veritable cocktail (ha) that works for me and truly don't worry about why they do- am honest with my dr and we adjust as needed (added an anti depreaaant a couple months ago as an additional layer of help) and on the whole feel so healthy it is amazing.
Honesty, use of the resources available to me and keeping my eyes on my HP and sobriety are working for me.