helpless

Hi .. my dad was diagnosed with secondary cancer 3 weeks ago after doctor wasted 5 months miss diagnosing a lump on his leg .. we have seen a Cancer of unknown primary consultant and he is giving a CT scan on weds ... the leg no longer apears to trouble him as much but the pain in his lower back is so bad his gp has put him straight onto Oramorph. ..I feel absolutely helpless and ashe I try to be strong for my mum ..children etc inside I'm totally heartbroken. ..