Funny thing about a lot of drugs these days - they may work well and change various diagnostic markers - but still not prevent the disease or malady they were prescribed for. My experience is that the medical community always puts diagnostic markers and statistical outcomes over a patient's personal perceptions.
I cut my statin usage back to the minimum 40mg dosage after trying to take 80mg. The doctor didn't think it made much difference, but was willing to prescribe 80mg because he just didn't give a ****. about whether if affected my "perceptions."