Hmmm, first let me inform you I AM NOT a physician and do not know your specific condition- (I don't even play one on TV)- however I did call on the top pain specialists in Atlanta/Seattle while working for a pharmaceutical company that marketed a chronic pain patch. I have listened to over 30 of the top lecturers on pain management from Australia, Italy, and here in the US. First, I hope that if you are on morphine 2x a day that you are working with a pain specialist- in my experience very few internists/family practitioners are familiar with alternate dosings for many of the pain meds (this is changing and hopefully will not be the case for long). I sold Duragesic (fentanyl) patches and just 2 weeks ago a dear friend of mine who had tried oxycontin, lortabs, vicodin, percocets you name it has finally gained control of her pain with the patch and is working out at the physical therapists 4 days a week.
First I would have this discussion with your physician if the morphine is causing the lack of energy or your condition. Second, once that is addressed I would start out slowly and make sure you're feeding yourself very well and resting well. Many times folks on pain meds don't get deep sleeping periods, exercise will help you get these, shoot for a 3 week goal of working out 3x a week for 30 minutes then increase it to 4x a week for 45 minutes- hold steady with that and see if you can manage it. While on the morphine 2x a day are you also needing breakthrough medication? Perhaps the dosing is too high/too low- you can build a tolerance/resistance and doses may need to be increased. But first I would have the discussion with your doc and know that even those of us not on pain meds have a very hard time getting active after being inactive for extended periods- it's about a 4-6 week period of consistent exercising when it kicks in as a routine and the energy is there- and quite honestly some days the energy is just ZAPPED!
Keep us posted on your progress and take it slow- but be consistent.
Tara