Just as en bloc said, your morphine will have to go up. While mine was in the stages of being titrated up, I had to do the same thing, take an oxycodone to get out of bed. Now that I am at 30 mg x 3 daily, every 8 hours, I only take the oxycodone on a very busy day or when the weather is really bad. I average one per day. I am fine in the morning, but that is with taking the MS Contin last thing before bed and again at 7 am. They really don't work for 12 hours for many people.
I think this sounds extremely hopeful! It is tricky to work with the doctor on this, sometimes you have to be very diplomatic. My doctor could tell by how many oxycodone I needed that the dose was too low, also my dentist said that grinding my teeth at night was a sign of inadequate pain relief and that helped corroborate what I was saying. They can't go up all at once but he should be aware that the dose will need to be adjusted.
I don't understand the warning not to take them together. I was never told that. Since the morphine is extended release you aren't getting it all at once so the timing shouldn't matter, should it?