I hate the prep too but a clean colon is the only way the doctors can get accurate testing. My dr prefers the golytely; the liquid does a better job of flushing the system apparently.
I'm due for another one next spring & sure wish time would stand still... Now if I can manage to get through it without DH catching on. He'd hover so much it would drive me crazy!
My Dr is part of a HUGE group, in fact most people here go to them. They even own their own surg center where they do all of these tests, they don't make you go to the OP dept at the hospital. They all use Miralax with no problme what so ever, it was prescription at one point and trust me, a large bottle of that stuff will clean you out.
My mom got deathly ill on that go lightly stuff, I would refuse to take it.