Don't take it all at once, it would feel great but it won't hold you 24 hours and you will pop another pill. This is how people run out of their scripts.
If you have been 12 years on 60 mg, it's normal that you dont find it to be enough; that's because your system got used to that amount of morphine and now it's asking for a dose increase to get the same effect from it. This phenomenom is called tolerance and your doctor knows about it
There are some things that can potentiate your morphine, but after a while you will be at the same spot where you are now, you will get used to the morph plus the potentiator.
Only options here are to increase your dose to get more effects (and, again, you eventually will get used to that new dosage) or decrease it for a while to lower your tolerance and then get your 60mg to work again