wanting to know exactly what hydromorphone is?confused about it,being treated with high doses mediacations and am researching lower doses and miligrams of pain killers to discuss with doctor-uncomfortable taking what all ZI am suddenly,is affecting me,having headaches daily waking up with them and going sleep with them usually since started ms contin er 60 mg plus hydrocodon 10/650 mg for break through pain,helps my major severe pain but having headaches&nervous taking something so strong-wanting know waht hydromorphone is&is it weaker,stronger,same type mediaction-smarter route than what taking?very concerned patient