My understanding is that Oxycontin generally does not last the 12hrs its marketing claims. My father needed it 3x daily and my PM says that he does not like to prescribe it for this reason.
If you want to find a longer-acting BT med, then look into their respective half-lives.
Here's one site:
Hydrocodone looks a bit long, but you'll have to take more MG to match the oxycodone.
Perhaps a better option would be to switch from oxycontin to a different time-release. You noted that morphine makes you sick, but maybe the right formulation would make a difference. One problem is that too much gets released int he stomach vs. intestines. So, if you haven't tried it yet, perhaps something like Kadian which is supposed to control the release until it passes through the stomach.
Other options would include Opana ER and fentanyl patch.
C4-T4 Scoliosis (disk degeneration, stenosis, narrowed neuroforamen, bone spurs), RT hip and SI joint damage from car accident. Also, pectus excavatum, supraventricular tacycardia and mitral valve prolapse syndrome.
Current meds: Ultram ER 300mg daily, breakthrough - hydrocodone 10-15mg, or oxycodone 5-7.5mg. .25-.5mg ativan as needed for sleep, Verapamil 240mg SR (for tachycardia). [/gray