To the OP (Original Poster), I have had these exact same experiences.....first time was with some ridiculously strong White Widow. It is all in your head. You are probably just a very sensitive individual ( I am ), and you pay more attention to your body's rhythms and melodies than most. Indica heavy strains are fine for me, no trippyness, no panic attacks. What FreeDaHerb said is spot on, my life experience would lead me to giving you the exact same advice!!