I too have heard that sativas are the strain for psychological problems, however Indicas are highly common from the collective I associate with, so I don't have much experience with sativas. Like oceanic and OhgR, I get the heart palpitations when consuming some strains of cannabis and I suffer from Panic attacks, agoraphobia, and anxiety. However, my anxiety comes and goes as it pleases, so sometimes I can smoke an eighth a day and have no problems and then a month later I'll smoke just a gram of the same strain and it will get me all bugged out. Basically I'm just trying to say that experimentation is your only answer. U too might find that cannabis (even of the same genome) alleviates and induces your anxiety. Just consume it rationally and U'll probably be okay. Keep in mind that U will not die off cannabis and if you start trippin' (I've seriously felt my brain jumping around in circles thinking I was dying) then it's time to lay of that gush 4 a while.