Switching from Oxy to Morphine?

To make it short,i have chronic backpain and damage in my shoulders.

Been 4 yrs that the doc put me on 30 minimum- 60 max oxy a day.

The point is,i dont need the stimulating effect or the energy anymore.

I have no work,cant even work and i dont have a social life.

If i switch to MS-Contin (morphine),will it work the same way for my pain but whithout the stim effect?

Im looking for a more sedating/calm effect,im tired of being awake on the oxys,thinking about how miserable this life is.

Can anyone tell me if thats a good idea?

And wich dose of morhine pills should i take to avoid being in pain and to be calm/happy?