Everybody's metabolism and internal chemistry is slightly different (which is why personalized medicine is slowly becoming a thing), so, whatever works for you I guess.
At least it's helping you.
edit: Practicing calming excersizes like meditation or yoga or whatever you choose may help too because it's all about the state of mind.
Uh. Not all about state of mind. Meditation and whatnot definitely can help even (especially, to an extent) with the more physiological parts, though. It's just entirely possible that it's far from sufficient even if you're very solid in regards to practicing the stuff. Sometimes yo' brain just be fucked up and there ain't much you can do (without outside assistance, so to speak) so far as tricking your body into unfucking itself goes.
... not that trying isn't still pretty helpful, most of the time. It's just probably a good thing to not downplay what aspects seriously can't be controlled, that there are in fact situations where you can't do jack (save cope/suffer, which friggin' blows) about what your body is trying to force your state of mind to be. Even odds I'd be in notably better shape if someone had jammed that down my throat a decade or two ago before I managed it on my own, personally.
tl;dr, the specific wording "all about the state of mind" is something I kinda' hate in reference to anything anti-anxiety or whatev' meds should be involved with.
Ruddy thing comes with that hanging accusation that folks that don't have it are failing primarily because of what they do rather than how their brain is screwing them over.
It is/can be both, but stuff like that and society in general really sodding loves downplaying the latter, which causes a lot more misery for a lot more people than necessary. It ain't all about the state of mind, however pithy the saying is *grumbles*