I second Sweetumms. Even the most complicated, or simple, sounding ingredients may not be. I use ewg.org/skindeep and good old google/wiki to scrutinize EVERY ingredient.
And I think I know how you feel. I sometimes feel like I'm still recovering from an allergy to SILICONES (yes, frikin silicones. It, and derivatives of it are in EVERYTHING) It was overlooked and prolonged for so long that now even fragrances cause my sinuses to swell and my once even tempered skin is now super sensitive.