Your endo is talking nonsense and appears to have swallowed Wyeth's promo blurb hook, line and sinker.
I suggest doing some research of your own to find out the difference between 'natural' and 'bio-identical' and what compounds are really in those tablets, many of which are not naturally found in the human body. Hank Gooren's research from the University of Amsterdam is good starting point.
Furthermore, levels of estrogen from conjugated estrogens can not be accurately measured in blood tests, rendering them useless for long-term monitoring.
I do sympathise though, because apart from the side-effects, I had a shapelier body and face from them, but long-term the risks to your health are far higher, particularly from breast disease and thrombosis.